Malicious PDF — malware analysis report

Static analysis result for SHA-256 908c0da8b9ab42e7…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 08:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 183113eb52aa4fa463e55ce2379b5aa7 SHA-1: d58cffdfabbd200420650dc3d105c6b09b5637fa SHA-256: 908c0da8b9ab42e7d08ecbd749330ea78ed3c3feba617a07e76fad0cf5d4a041
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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://crophysi.ru/wix?keyword=letter+of+representation+sample PDF link annotation
    • https://cdn.sqhk.co/ragekasa/4jfifgh/leatherman_raptor_warranty.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_60116ed763a41.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/Ld8Jwjb/taginaroteko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fcb32bd20932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5ff54169e3116.pdfIn PDF document text
    • https://midusafamiriron.weebly.com/uploads/1/3/4/7/134702540/6898374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500677/normal_6002c65eca9d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_5fdc7142f36fe.pdfIn PDF document text
    • https://sewimoranekodov.weebly.com/uploads/1/3/0/9/130969375/993973.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416796/normal_5fc5d1650b7c6.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/jdCXZeQ/lejajegomafujiwejededug.pdfIn PDF document text
    • https://kaxojolomo.weebly.com/uploads/1/3/4/8/134885197/jokimite.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/1063ff87.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/d1d118e30f1e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suluzisose.rf.gd/answers_to_happy_birthday_wishes.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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 4988 bytes
SHA-256: d3c8e629a11d8d47419935d5ef3a13c36984041ca185e1bf085ba2cd6b3c58ba
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 10916 bytes
SHA-256: e35df8b35b82090446938f926561c1d15c586f56c1f543234683f9c2e8618b25

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