Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2c5de69ba0c692a…

MALICIOUS

PDF

111.0 KB Created: 2021-03-18 04:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 622e0276cf536ff7d8be193e385f0529 SHA-1: d27dd389056e188fb3385e8034b96c96b8d5d9d1 SHA-256: e2c5de69ba0c692aae0b17bbdd4ad0d520fc937b643ce35b7e031a594ca5ab0c
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are part of a link farm designed to boost SEO, and one of which is a known phishing URL. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly indicates a social engineering attempt to defraud the user. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=accelerate+learning+student+journal+answers
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5fc922d18c286.pdf
    • https://cdn-cms.f-static.net/uploads/4417824/normal_6029c3e91534c.pdf
    • https://cdn.sqhk.co/xuxovunevo/jgdhbeG/58150444663.pdf
    • https://cdn-cms.f-static.net/uploads/4387424/normal_604a2bf3cffa6.pdf
    • https://cdn-cms.f-static.net/uploads/4478146/normal_5fe6b22de2428.pdf
    • https://static.s123-cdn-static.com/uploads/4474992/normal_5fca4ab44d7d3.pdf
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ffe7f18c7b59.pdf
    • https://cdn.sqhk.co/bapuwanuvadi/eigGwhf/42656602186.pdf
    • https://cdn-cms.f-static.net/uploads/4478927/normal_604945e021ea0.pdf
    • https://cdn-cms.f-static.net/uploads/4418001/normal_603d20c14abc1.pdf
    • https://cdn.sqhk.co/gamakokub/gdRNoEM/oxenfree_achievements_guide_xbox.pdf
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5ff0a984019cb.pdf
    • http://foxunuvixas.iblogger.org/nivanud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gulopajekojof.epizy.com/guideline_dm_2019_thai.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_1517d9b3b0474884a11ecb796c2d3738.pdf?index=true
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_0d9d4946f55b468db8a477b84fd9c7a6.pdf?index=true
    • http://puribobelumisi.rf.gd/adobe_acrobat_word_count.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_off0001756e.bin
221055ea4c5cbe6371ffe2adf158f0fcd8c5bf51e0e14541d7e2f5a5345eb461		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1756E 5264 bytes
font_01_sfnt_off00018776.bin
358f841854cb604b045d359b08a6999a4f65c8c323e57deceb8b8184b481a682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18776 10828 bytes

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