Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8b8579b9cd7ffb…

MALICIOUS

PDF

93.4 KB Created: 2021-03-11 06:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1d0a70ec79def95785fc664ac936b110 SHA-1: 39e8122e39052aba74233b4fd94a223e19e3e176 SHA-256: cc8b8579b9cd7ffbebb754cb34f0d5f902de9430a8107149985c9a575ef367e7
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=contrato+de+arrendamiento+sencillo+mexico+word In PDF document text
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/wejazeti.pdfIn PDF document text
    • https://xavozunop.weebly.com/uploads/1/3/4/3/134305705/xekitavufovevame.pdfIn PDF document text
    • http://wejaduz.mypressonline.com/nutajek.pdfIn PDF document text
    • http://gepanukotex.getenjoyment.net/muluporivuvorave.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/wival_texadugisob.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/AicgfIK/lathe_machine_price_olx.pdfIn PDF document text
    • https://jinepesel.weebly.com/uploads/1/3/5/3/135346763/90cd9236a0.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/rowenta_compact_steamer_reviews.pdfIn PDF document text
    • https://wusumojasojufe.weebly.com/uploads/1/3/4/3/134352244/dixodimuwizotabu.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/077dba09757.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/r10Lhfh/jutivamosadusifurube.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/tilowunan-guwenozakum.pdfIn PDF document text
    • https://lazarapo.weebly.com/uploads/1/3/4/5/134528324/vemowagad.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/Mr7hbjj/parachute_game_and_watch_ebay.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimurami/difvjaL/jawbone_up_app.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/kjfiaxF/b612_beauty_filter_camera_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77577892-cf92-4010-917b-bd8fe2efbe21/13733714738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6a0327-4980-469f-864d-e7e6e16805b5/18849427839.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/fuxotitusolasopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9ea0e5-775d-451f-afdf-3ab771aa7296/what_is_the_best_homemade_smoothie_for_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/ankush_movie_hd_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ae6fae-b281-4215-a6ed-731e4d1e623d/euro_pro_x_sewing_machine_deluxe_denim_and_silk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fbee143-269e-4b0c-b5ed-22b8d2e719ea/43087946638.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/dural_arteriovenous_malformation_congenital.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/america_the_essential_learning_edition_volume_2_2nd_edition.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 5152 bytes
SHA-256: 06f68aeb68cbad07033da2a6163e6036b25c2ca27fa4d9597a4ede24654c9f1e
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 3208 bytes
SHA-256: b2e2ae06a372075f26c39afc3742ff769753e65cc901503c35a6650fc4773382
font_03_sfnt_off00012b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B24 11616 bytes
SHA-256: ce9d93a6ab322b4a0678cba56b6a6d6287bb192cdde1113c0a0244193a9dd050
font_04_sfnt_off00015106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15106 16240 bytes
SHA-256: df296bbe90ee1428a55b0ca074e3772e82b4c7fd4e1556b21bfb5969c9b9cc66