Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb198e54f67c380…

MALICIOUS

PDF

120.9 KB Created: 2020-12-16 21:59:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a52611c9dd25108c3a297ce6f7e8ff4 SHA-1: daf72cbf46208206695aa4eaacd9a58e3989168b SHA-256: 0fb198e54f67c3805b72421ca409b5d697dcbcccbf71ed6dfc7ecda805575070
196 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users with promises of prizes or large sums of money, requiring them to take further action, such as downloading another file. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest it's a lure for a phishing or advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://trafficel.ru/123?utm_term=executive+vp+job+titles
    • https://cdn-cms.f-static.net/uploads/4382948/normal_5fae2424b1ece.pdf
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fcfec8c98e8a.pdf
    • https://cdn-cms.f-static.net/uploads/4458631/normal_5fb2e3e7c39f2.pdf
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5f985c4c83b15.pdf
    • https://cdn-cms.f-static.net/uploads/4467561/normal_5fb721f9e1685.pdf
    • https://degezumibupupek.weebly.com/uploads/1/3/4/8/134862322/dokafuwagaloxe-vazepumi-sozifa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wiwuxot/bopidonuforebene.pdf
    • https://static1.squarespace.com/static/5fc6ea2a10d6a92a7368d982/t/5fcae8ff190ee82df8d2580d/1607133445762/vodizamuvutirazaxab.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/sasidevufaxalofoku.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe111c3f75b166439cc194/1606291741310/iogear_kvm_hotkey_not_working.pdf
    • https://s3.amazonaws.com/kosipefojaw/60178170293.pdf
    • https://s3.amazonaws.com/xamibudasagas/54048889575.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_off00019da3.bin
6bb4fc11da95ba2cc2a98a734e18952efbfd64f68fafab3820cba9de940ffff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19DA3 4924 bytes
font_01_sfnt_off0001ae87.bin
e9702df25d7fe592135de85991bd6841ba2d1ac2d3fa8105cdd73c2ae6d9fd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE87 11696 bytes

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