Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5606bc76663ed1…

MALICIOUS

PDF

131.7 KB Created: 2021-03-13 15:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec72b4794b65588b84bebd75cfc680e7 SHA-1: 57e0555cc2a7e876f928e039e9ccfe68d2e72ffb SHA-256: ca5606bc76663ed13899628c736b78c3b342aeb19a2d1e20e18d0f14eab32ee6
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://ponafet.ru/123?utm_term=bahubali+tamil+movie++tamilrockers+single+part PDF link annotation
    • http://domainlimax.xyz/free_spades_app_with_jokers2hch9.pdfIn PDF document text
    • http://batut.space/55103540745xl9u7.pdfIn PDF document text
    • http://mishabelle.ru/7003549734xz8is.pdfIn PDF document text
    • http://furniture21.online/babunupageverawije4ao.pdfIn PDF document text
    • http://fringigejy.site/407418451238iyav.pdfIn PDF document text
    • http://komarovskii.xyz/xibumepakenobowidilosudepouq3.pdfIn PDF document text
    • http://dalkomis.website/52362767575fe1z4.pdfIn PDF document text
    • http://pc-remont.website/how_much_does_starbucks_pay_baristas_per_houriuofz.pdfIn PDF document text
    • http://znalomstvavip.site/washington_wizards_record_last_10_years4x0sn.pdfIn PDF document text
    • http://hookup757.fun/masonry_wall_design_spreadsheet8v6ta.pdfIn PDF document text
    • http://letgtma.bid/frederico_basso_montanari_fuelec6wc.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/b322e18e-2264-4d22-b042-264602242918/nokapidepudapozexivuboka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b247ff-25a8-490c-9a58-2b1cbac3a1f8/85583819811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e16650e7-f3fe-4639-a923-6003f8d11145/cuisinart_toaster_oven_broilers_chefs_convection_toaster_oven_tob-260n1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941cc289-3470-4b0e-b40d-e93e9d6843a7/jikojaputo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24989ed-e30c-4fb0-a9bd-6f8d52c4c64c/rhetorical_grammar_for_expository_reading_and_writing_module_2_answer_key.pdfIn PDF document text
    • https://1b15a19f-c8c2-4d9d-8c2f-e97aa7ecfe2c.filesusr.com/ugd/eb6c48_e0972a5ef9214dd1becbd91adb7facbd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2d29a0-fe53-41bc-8432-9a4c1c0f9e6c/old_love_songs_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c83b57-9745-4c0c-8a40-b5ab44740573/how_to_fix_a_diaper_genie_elite.pdfIn PDF document text
    • https://ba739632-11db-41f7-a023-683a20e55d36.filesusr.com/ugd/99835b_1503d383b69d4c7c944006d07a8325c4.pdf?index=trueIn 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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000193f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193F1 7184 bytes
SHA-256: 63d4933e255f6bbfbba1763f626a36822ed0f38cf45e416e25ea4cc3b0a0e226
font_01_sfnt_off0001ac32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC32 5660 bytes
SHA-256: 554f159034faf757c8b1ed8de0b1cee1f3419cdf451dc37d0ec86a1ead8b32af
font_02_sfnt_off0001bf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF49 13164 bytes
SHA-256: f99826eacbd3adbabe063bd9b6eaa41e4677c024ae1012473a94de3f45bb36ef
font_03_sfnt_off0001ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA34 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3