Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfd1036af40530d…

MALICIOUS

PDF

67.6 KB Created: 2021-06-01 12:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 524b72c18a41b329d8db47e841781d1a SHA-1: 59261277c2253c5e09cd985d99fba672ad57d61c SHA-256: 5dfd1036af40530de93152382e9d169396a3628b5ae2c571a268e56c126bb23f
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 0.9998

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://nomylo.ru/pbw?utm_term=placement+test+amideast+pdf PDF link annotation
    • https://fudisilutopunus.weebly.com/uploads/1/3/1/4/131438012/a82f785277a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_602c4ceb4f76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_606e479816c75.pdfIn PDF document text
    • https://vimawagugagepa.weebly.com/uploads/1/3/4/7/134732412/6df38cc8.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/wawivofafedezu_xadiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_605a443332edc.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/442040dc-06b8-426b-9c92-ca20ab25e915/17812452244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d970a730-18be-4423-9b4a-9d786b2ee8e1/planet_fitness_workout_plans_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a801fe6-f9ca-405a-a97c-83d20dbef516/mha_ib_acio_2020_exam_date.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/bully_anniversary_apk_data_200mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c38019a8-7ba0-42ae-93ee-2b018d87b4c5/15244863308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8357a9e-f1c2-496e-9c80-7aa423911165/98968584588.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144421254/cease_and_desist_letter_slander_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b3b894-45cd-4e1a-816c-4259bcbe4a66/virgil_aeneid_book_1_translation_quizlet.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414834/pifumosezokowuzow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c176360-64c7-4398-ac77-65fd8c697c7e/48847740457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c0ed59-9e93-40a3-881b-2f76d92247c1/7479708513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3296563-68bd-4494-af04-1cafbffee1fa/luveduxogogedezez.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_off0000cc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2B 5208 bytes
SHA-256: 31b07d38f4ef889d7775e476f0e305c5286967737f8c96e134378a3199bed7da
font_01_sfnt_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 10392 bytes
SHA-256: 9f4948c77ae7a8eb7042cb501611b2d3cb3fecb745088e68c8dd2c04e4a6a2d2