Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36e312e3f535432…

MALICIOUS

PDF

64.8 KB Created: 2020-11-18 12:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: da8eda2e99e7227c35d1866a6b980cc3 SHA-1: 9097d1ab192a9702569d15343ffed079874414ef SHA-256: d36e312e3f5354327d73bd92d1388c521dcf5febd868e8da3ce9acbe3c84c57c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=word+that+starts+with+c PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5f9e3cbe3dc88.pdfIn PDF document text
    • https://bopiwode.weebly.com/uploads/1/3/4/3/134367631/5365896.pdfIn PDF document text
    • https://wulonuvesiga.weebly.com/uploads/1/3/4/3/134362584/lepakumelemepafe.pdfIn PDF document text
    • https://lixezakokigek.weebly.com/uploads/1/3/4/5/134596317/vugobutov-toxoxeka-zaruxowikuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5fa30fc7a992d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_5f9b0ab95f737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_5fad74b753cff.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/duxaperipimodisebag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fa7dcf4b6c04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_5fb359551c507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fac2f358f4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_5f8c6bb3560f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_5f9979c5634d9.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/67fd217a-d67f-4a3c-8c00-66f5b46b9646/bawosolezenibosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63e832e-e473-4784-bd47-a4c16d549602/hlsr_performers_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80fa34c-50ac-4440-bda2-4295268e8499/power_bi_slicer_groups.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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 5100 bytes
SHA-256: c48ecaf8604712019bd5368868a76f559eac0d397012a58e8be039ba64b269d0
font_01_sfnt_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 9884 bytes
SHA-256: 251589e73e27bc0895c9ddc3a1c2e04451503f37a1c07d016edaee3a340e7b97

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