Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b7fc2e712c84c7…

MALICIOUS

PDF

71.3 KB Created: 2021-03-29 19:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23a3c1b90f713ba081b864d4a7adda8f SHA-1: 6d4ba84b36e9162871b6635d2d89c93cf93d640a SHA-256: a6b7fc2e712c84c701fe75f84f99424fdbb807c54e76ab3ab873ea47f30e4be9
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying a 'link farm' likely intended to redirect users to malicious sites. The presence of embedded URLs and the overall structure suggest this document is part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/wix?keyword=chapter+5+managing+risk+with+the+ipde+process+page+19
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6043683a0192a.pdf
    • https://cdn-cms.f-static.net/uploads/4376878/normal_60581d2830abd.pdf
    • http://zujewubowufonug.scienceontheweb.net/makeratu.pdf
    • http://xozapab.22web.org/decimal_word_problems_grade_6_worksheet.pdf
    • https://cdn-cms.f-static.net/uploads/4495696/normal_602179b9ec6d5.pdf
    • https://cdn-cms.f-static.net/uploads/4393763/normal_602e345484abc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirofopafu/83815501715.pdf
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_5043f4e6101845f5815325aff0fb2e67.pdf?index=true
    • http://pisumapopub.rf.gd/vesovujafiwuxofinesudet.pdf
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_49596b05a51e47c89b9fe84cc5b18e64.pdf?index=true
    • http://xoxuvenopojox.rf.gd/capsim_simulation_guide.pdf
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_6a3935782592407182dd1fbbe8c1a797.pdf?index=true
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_6d5a82f5dc754a4d8d07b0eed4e98236.pdf?index=true
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_65de3add6ea74399a976f93fcb4b72cd.pdf?index=true
    • https://s3.amazonaws.com/jotizifime/77580460121.pdf
    • http://puxakuxuvon.epizy.com/craftsman_yt3000_belt.pdf
    • https://s3.amazonaws.com/xupimaral/inverse_of_a_3x3_matrix_shortcut.pdf
    • https://s3.amazonaws.com/xeruxaxer/kemper_profiling_amp_white.pdf
    • http://gosaduzunake.myartsonline.com/xunovugizutimek.pdf
    • http://baromar.epizy.com/bible_in_kannada.pdf
    • https://s3.amazonaws.com/fajixe/puzagozebunej.pdf
    • https://s3.amazonaws.com/dukexajuj/78677750979.pdf
    • https://s3.amazonaws.com/fatikonavori/snugride_click_connect_30_infant_car_seat_safety_rating.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_off0000d648.bin
8d079a872b162a0025d6c9350b5f8a90c7b0189818df0b335669137f3ccb1739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 5848 bytes
font_01_sfnt_off0000ea1c.bin
54006e9e5fc25dc20d979c1b27c8f6972a9d1a8253766ddeb5ab5cedd26febce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 10420 bytes

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