Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a11a370ce209b31…

MALICIOUS

PDF

143.2 KB Created: 2021-03-23 00:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a15366c733de256341ffa8a9487f98a1 SHA-1: cf595338fe6288ef6a32c3fd345c9fbf7c052e68 SHA-256: 7a11a370ce209b3137bcbea47e88070e5c78b8b722e02ca8e6a8b11288ae7281
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/wix?keyword=lawson+property+management+woodland+ca PDF link annotation
    • http://waxedeb.getenjoyment.net/definition_of_antioxidant.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/HjhdUPK/stacky_wacky_burger_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/eihagfZ/vufenimasudusitudaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/rz0jjic/75001294665.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/jhPihhe/nibelufizegumerapa.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/ijQjgii/the_cw_seed_app_apk_download.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/tony_evans_bible_commentary.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/does_my_head_look_big_in_this_plot.pdfIn PDF document text
    • https://werumitepoli.weebly.com/uploads/1/3/0/7/130739038/2740181.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/ip0rr7w/harris_jayaraj_telugu_songs_jukebox.pdfIn PDF document text
    • https://kogevinipuban.weebly.com/uploads/1/3/4/5/134514077/3976a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/qhhhdhd/rabukuropafuzupinifif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_30ee8b24a8dd4b518ca9051ca8b32246.pdf?index=trueIn PDF document text
    • http://varirojemixu.myartsonline.com/operational_amplifier_ic_741.pdfIn PDF document text
    • http://xasagode.myartsonline.com/zuwazine.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/pdf_ceros_dan_batozar_tere_liye.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/sigapunisekubaxujubawixow.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/bandaging_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/vepajupexejetededinivosop.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_5d3b118cc0c445c1b86689fb4d3c44da.pdf?index=trueIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_dd856aa51f604c16a58ae6a1da99ec42.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1B5 5528 bytes
SHA-256: 0bc85925bbc6ec22b042d4873fe1a212e7cafadf33889272d1dbc9dbdeb37b0c
font_01_sfnt_off0001c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C488 29392 bytes
SHA-256: ef5683b4571521acded02e5905f813a836e9b14f407c79aa40c9291ac967e3d9
font_02_sfnt_off00020f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F8F 18408 bytes
SHA-256: b626d26c62f1462bfa6efa21ae5e4f00b2c9b04d2f8de6157d00bbdd13de672b