Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bc790f6aea565f…

MALICIOUS

PDF

76.3 KB Created: 2021-06-10 00:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b01cf230ab8f49a974ae92264d65dd5e SHA-1: 5103fe1f505ab59f61c082387f702c84b5420a06 SHA-256: b9bc790f6aea565f0d549e4013f3cd1a321d2fee5f6b9f270eef592d91c409f1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. The embedded content, though heavily obfuscated, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://drafthe.ru/pbw?utm_term=head+soccer+unblocked+no+flash PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473410/normal_601aac0af2951.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/5263343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446781/normal_5feb07e74b6a1.pdfIn PDF document text
    • https://xagewomovow.weebly.com/uploads/1/3/4/0/134040632/6886345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_60b8d1038103b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_60bf43e9d0005.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/leligufux-japijiwige-xununevu-wuxamipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_5fd200936cf3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5fdd340d781c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_6058deb529646.pdfIn PDF document text
    • https://voxasofipazo.weebly.com/uploads/1/3/1/4/131407247/fisuwosemol-ponoponeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381748/normal_6026ff8a5ca99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dadff2a6-8652-4ae9-8072-dd6b00972434/how_do_i_connect_my_wifi_extender_to_a_new_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ba64a8-fb42-489d-b52b-071ee138bb7c/98900464134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ca0541c-ba73-48da-802a-8b32e7e14dd5/gepizuwosib.pdfIn PDF document text
    • http://zaxovaleso.pbworks.com/f/93450665420.pdfIn PDF document text
    • http://kufugaref.pbworks.com/f/watch_faces_for_amazfit_verge_lite.pdfIn PDF document text
    • http://wuxewuda.pbworks.com/w/file/fetch/144939924/oxford_handbook_of_anaesthesia_4th_edition_download.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/52095570217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7163b780-deec-45f2-ab7b-8b2cd40fd0c5/how_much_does_lash_extension_training_cost.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/the_outsiders_chapter_9_reading_comprehension_questions_answers.pdfIn PDF document text
    • http://jorowad.pbworks.com/f/mkv_format_to_mp4.pdfIn PDF document text
    • http://rasovuxosew.pbworks.com/w/file/fetch/144780405/54791982304.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 5028 bytes
SHA-256: d3440b7664d5d2ebe1425d1d81935982d4f8f6764b120d426231361b1395ed12
font_01_sfnt_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 10500 bytes
SHA-256: 65dc577beaee6d891a7bf8593dd5eb481fb8bd96057c4d7a6fd9d8f87b96a100
font_02_sfnt_off000113ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e