Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6afe91c8860bda…

MALICIOUS

PDF

79.0 KB Created: 2021-06-07 20:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5d58efbf1764a19c56b7517137660e74 SHA-1: 5fc81fb710c8e3c28ca0322aa90bc34ef929622d SHA-256: bb6afe91c8860bdaae39b4d2ab371ee655b39ffaa815e0878ff46ff44b3959ea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://medvor.ru/pbw?utm_term=does+natalie+portman+die+in+thor+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467912/normal_601fb5c5d27a7.pdfIn PDF document text
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/761043.pdfIn PDF document text
    • https://devusabuzanuwuz.weebly.com/uploads/1/3/4/3/134352374/331500.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/7c754.pdfIn PDF document text
    • https://vifekifuveju.weebly.com/uploads/1/3/4/5/134597055/boresazunige-temiluvo-batanepelewek.pdfIn PDF document text
    • https://majuzifulanapu.weebly.com/uploads/1/3/4/8/134887757/9365888.pdfIn PDF document text
    • https://pimujupaz.weebly.com/uploads/1/3/4/4/134440235/64f1e4283d871.pdfIn PDF document text
    • https://tavikumor.weebly.com/uploads/1/3/4/4/134476146/17354721e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fcfa4fcef999.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/botapulariwu_nokirukaxoduja.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
    • http://lifabukis.pbworks.com/w/file/fetch/144805113/plants_vs_zombies_garden_warfare_1_pc_gratis.pdfIn PDF document text
    • http://risodige.pbworks.com/f/roresutaxevilivukafojet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3b2db7-01d4-4f23-a33b-4926c0b5c287/lean_muscle_body_diet_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db747c05-791f-4628-893e-91b181a7e1df/zedizogivobudofijegatanas.pdfIn PDF document text
    • http://gudikijuruf.pbworks.com/w/file/fetch/144479487/how_to_activate_autocad_with_keygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0074bd5c-f01e-47d9-9443-bc38c211aaea/69995292218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f19655b-8b43-430c-9d13-583614c059ec/chord_sheet_guitar_blank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54d47f1-4b86-4dd3-9b88-cf95ffdcf75c/how_to_prepare_for_etl_developer_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df85df23-bb73-4390-9ec8-bfb43238f1f1/widulegugemomegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a69b28-adf1-4550-8856-c9e1c6877e17/will_turtle_beach_work_on_ps4.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5116 bytes
SHA-256: 8579fe7c68c14ba71873b5509e0e42818e384ad8242b467ede98bce06ec75564
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 10868 bytes
SHA-256: 8fcb128ce4d9bebd79e19c6b752079affb721894c281d5853ec0050cf75de5d7
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f