Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef36fcf48fb5fca…

MALICIOUS

PDF

74.0 KB Created: 2021-06-10 17:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e172ed04730952ec8ed81c8370fde299 SHA-1: a8e5cee1c9851cbf146c747c5f993d6f89139ee6 SHA-256: 0ef36fcf48fb5fcaab60929bf5d2b3635e32b9b6300b4e27ff88240fcc5cf2e3
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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=papa%2527s+pizzeria+hd+free+download PDF link annotation
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/nunelawakepimaz_kutewixagolaket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424933/normal_601d398078958.pdfIn PDF document text
    • https://nesoximitegemaw.weebly.com/uploads/1/3/5/2/135295679/9763539.pdfIn PDF document text
    • https://guveroza.weebly.com/uploads/1/3/4/4/134484502/suguwupuned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446917/normal_6012f91c2a258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_6060511a47a70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418762/normal_600796b4aab48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_6048c76f0537a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4427080/normal_60b362f670187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_6012f7ba65297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_600bc7f8bc43d.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/4972815.pdfIn PDF document text
    • https://javesuput.weebly.com/uploads/1/3/0/8/130873829/5279499.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460045/normal_60b1b1440957c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369928/normal_60274e3a388c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502817/normal_5fccb204cb39b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fe1c61836f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370284/normal_60364a472bc32.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/379d026a-2458-40b8-8a5b-aeed7d827d44/90758434985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be805fe2-f985-48c6-a028-d8d2ff2c3f91/megelovetoxafotomegopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cc4646-60c9-42bb-8970-a352782e3f2e/14507019260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8ae6300-5eb7-4400-9e46-945e30d7263f/dd_plane_shift_zendikar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c150c2ee-622f-4847-bc86-beaaf0d763cf/librecad_commands.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c500d10-0676-4d05-96b3-d36814baaf9e/sou_matome_n2_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43875910-3b47-4567-b4e5-484cd6b8c7b7/jak_zdoby_wild_honey_w_slime_rancher.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 5304 bytes
SHA-256: ae1209b166ab985f42baf4a6abb3cf7aa6c0e2be2851c6f0be33b380f0ec9384
font_01_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 10984 bytes
SHA-256: 78648c1b2fa1eb308e8ddcda3a4ebb7191f78db60b0a3e0c6c0bcf79f63f2dc0