Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3e1849ca47bc10…

MALICIOUS

PDF

86.3 KB Created: 2021-06-11 09:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6132ce505e4fc26bda5e694bb5a79ca5 SHA-1: 171a65d537464602cad40cf4a053e176d8e71796 SHA-256: ed3e1849ca47bc10b06b0fa94388b5b13a8598bb44f4311205387c45bd60edf3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary URL, https://inwebjor.ru/pbw?utm_term=nullification+crisis+worksheet, is likely a phishing or scam lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links indicate malicious intent, likely to redirect users to malicious websites.

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://inwebjor.ru/pbw?utm_term=nullification+crisis+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452609/normal_6003266786f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458852/normal_6037ff58346a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444643/normal_60563798e42b8.pdfIn PDF document text
    • https://daxuwolazu.weebly.com/uploads/1/3/4/3/134335064/jimebudexezosamave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_60616b7a658aa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381318/normal_60b4b87523608.pdfIn PDF document text
    • https://bomovote.weebly.com/uploads/1/3/5/3/135398027/600955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490523/normal_5ff65f3ca89b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443810/normal_603995b5a2294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_60538d30638a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5ff52d1a34b57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461495/normal_602e1d19b4902.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4381971/normal_60b01542a123a.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/e4ef1a6b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_60503bba94e94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_5fdfa960a0cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_604d17021c948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 5092 bytes
SHA-256: 6d74f64d5c02bc849d2dba83074c7b994334c6d235b6a988c0de5fc2342d5088
font_01_sfnt_off00012883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12883 10516 bytes
SHA-256: c7cea5ab808f6459c4d059ba1d1b200c81b738cdcf8c03f422b46cc435f32dca

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