Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0d4f49cc796dd2…

MALICIOUS

PDF

67.9 KB Created: 2020-11-21 16:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a0095bed6d4b4aec808357fda2832e SHA-1: 5821bccaf31ee27304efd35da0d5135146748f97 SHA-256: aa0d4f49cc796dd26f745bc18ab7f1acfca81d7b1cd4ea5110a2df24cfbaae00
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=business+communication+today+pdf
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/goxesazazoxiner.pdf
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/dabuwosevitumiw.pdf
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5f9bd9ef0f5da.pdf
    • https://woxawilafuzuve.weebly.com/uploads/1/3/4/6/134669094/mezexadejuderuzafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokixovuxik/20134189339.pdf
    • https://s3.amazonaws.com/fuwawibu/gatexevesetotujenezutezax.pdf
    • https://s3.amazonaws.com/ropuba/98551344011.pdf
    • https://s3.amazonaws.com/vesubodufisi/corso_italiano_gratis.pdf
    • https://s3.amazonaws.com/rovuweraja/voxengo_span_user_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d003.bin
2f7226ff723990dbaeb64d1ef5a2d127d5269c68f08e85b62103af4fd41681c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 5324 bytes
font_01_sfnt_off0000e220.bin
090020776af825af5949208fadd5370a96c551ed322e17edc29e8bfbd75f4d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 9992 bytes

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