Malicious PDF — malware analysis report

Static analysis result for SHA-256 af252ad21f9bbecc…

MALICIOUS

PDF

114.6 KB Created: 2021-04-04 07:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b001bbf45c66e07df16cc3a4682542a9 SHA-1: 26ccb914b7694d4d904cabff4637a6b2b2f6b7a6 SHA-256: af252ad21f9bbeccecce6c39844fb282009d0290af58ab4d604879764eca2a9d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous external URIs points towards an attempt to manipulate search engine results or lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=what+stage+of+the+hero%2527s+journey+is+represented+in+this+passage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467287/normal_60450d1b26f07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_6047c35cc988d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_600bcbc663b59.pdfIn PDF document text
    • http://surozofawowidom.scienceontheweb.net/types_of_endodontic_files.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/english_grammar_for_beginners_free_download.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/xabufepubebapemubema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_605441ec2997a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fe2ce1ae584b.pdfIn PDF document text
    • https://tawixepew.weebly.com/uploads/1/3/0/7/130739069/4003667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_601a4320aee3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_60291cb318afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_603f467edcc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6030773bb82a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369149/normal_6038731a10ce6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekolutewubel.myartsonline.com/functional_behavior_assessment_form.pdfIn PDF document text
    • https://3682d434-6e27-4ac8-9ac2-d3ec24fa429c.filesusr.com/ugd/9b5f63_5f1424be31394bffa99d3756ddf23d25.pdf?index=trueIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_8a111f92733e490388eeb0132a6fabf4.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_3629d4530925497aa6cd6449995128d6.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_off00018343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18343 5496 bytes
SHA-256: 0f610a7cebd48d62b1fb525e5f777c8102c5e4465a0d4151d0a6bf00b3035986
font_01_sfnt_off00019612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19612 11928 bytes
SHA-256: 7e0bb8dd454c3ee739996cd88e7268b276356a0b1561399f7c3ed7b389c3827c

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