Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa71836eff012392…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 21:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6494824642d8992208716a9538d17c30 SHA-1: a6c0f86cbc3bcbc57c4331eb0d8e5c529e8fdee2 SHA-256: fa71836eff0123926ed78dfc9988bbcf2a549179bf65c410793c19451385c4f8
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://nipisod.ru/strik?utm_term=what+do+universities+look+for+in+a+personal+statement PDF link annotation
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/ditarawalokap.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/goxarotafimeg.pdfIn PDF document text
    • https://defejeve.weebly.com/uploads/1/3/4/3/134386135/8f21155.pdfIn PDF document text
    • https://mulafixi.weebly.com/uploads/1/3/4/3/134317856/rusudoligove.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/jRicvjd/akc_trick_shot_cop.pdfIn PDF document text
    • https://kusipujetaz.weebly.com/uploads/1/3/4/4/134462876/4827015.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/tonimonujalagim.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/hggiVhf/starship_troopers_battle_stars.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/e68562ee-b453-410d-bddb-082ce907a633/21883368383.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/84317666281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581e1088-d69e-41e3-92c7-52261cbb389b/wordpress_login_admin_not_working.pdfIn PDF document text
    • https://1527c8d3-3321-4e9f-872f-e2bebb57bac2.filesusr.com/ugd/bf2d42_2311d7dbb9814dadb364b7b200972cfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3967fc10-5bc6-4ee6-ab9e-d777b0cafd19/whats_the_difference_between_the_new_and_old_testament.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/java_7_update_80_32_bit.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_360edb30dee34fcca96cabc2077c846d.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_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 5416 bytes
SHA-256: 693b42878509ea3691a2f107cfd7e663f5ea5117bcbce1c3f40c523e150b46cc
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 10728 bytes
SHA-256: 9c1a32bda68df8fed52acd025f86dfb3fabf0ced52011b02494f4eefe12fd983

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