Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77bf3b7897d459…

MALICIOUS

PDF

72.4 KB Created: 2021-04-05 03:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e244bc0cbba174e7c2ecd86f4f076f95 SHA-1: dad692377fa76f79f108e2db48da48de9c5dcc71 SHA-256: ea77bf3b7897d459d4377d7287ab7a4868bfc6b50580b97dbee19ed4147c4776
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 0.9996

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://baarspo.ru/strik?utm_term=why+should+the+bevel+be+facing+up PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421471/normal_5fd619d385171.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/8777123.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/ghkcjey/adults_coloring_books_color_landscape_pictures.pdfIn PDF document text
    • https://xenuwupe.weebly.com/uploads/1/3/5/3/135329542/1554790.pdfIn PDF document text
    • https://rabibusapufatov.weebly.com/uploads/1/3/5/3/135301207/1012490.pdfIn PDF document text
    • https://cdn.sqhk.co/linaxezo/b7OcgVt/bomb_manual_version_1_espanol.pdfIn PDF document text
    • https://rakawixedisika.weebly.com/uploads/1/3/5/3/135324789/2317350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382772/normal_5fe865828a9de.pdfIn PDF document text
    • https://megeleju.weebly.com/uploads/1/3/4/3/134319984/lemedajuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_6010a81e8d711.pdfIn PDF document text
    • https://dewokipapofoz.weebly.com/uploads/1/3/2/7/132741709/5471416.pdfIn PDF document text
    • http://motikadumumelu.22web.org/kitchenaid_electric_range_burner_not_working.pdfIn PDF document text
    • https://xuvakaxatal.weebly.com/uploads/1/3/1/0/131070170/2335858.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/aUgchd8/xufolud.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/chjbuif/shark_attack_maui_video.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://losuguv.epizy.com/65029217446.pdfIn PDF document text
    • http://dedeseb.rf.gd/pharmacotherapy_a_pathophysiologic_approach_test_bank.pdfIn PDF document text
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_a2452c9762bc4ab1b28a87619a131741.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_72380254e79841bf87cecdade7dc89c4.pdf?index=trueIn PDF document text
    • http://vomepixoj.rf.gd/difference_between_parliamentary_and_presidential_system.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_d9114f427a4047088c4d4f28b60670aa.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_284b4d7d7183475db656d259ae68a6b3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4B 5636 bytes
SHA-256: ddecd6cd9698f6cd21ee115c86471835eda3fbbeca8ef7537495109d40e0d883
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10872 bytes
SHA-256: e1de689eeb9da56c9fdfee903577a0809cebb858b6d7d0d6c05536b6e7bada36