Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fd82f03dc61439…

MALICIOUS

PDF

78.9 KB Created: 2021-03-15 03:26:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b28c73aaa56e17ce41de2625163b51f SHA-1: 2e44627d992ae6f29010d39d0040706d3ea2aad9 SHA-256: b8fd82f03dc614396aeae276197a559b2fa8a1d07e58538dc9f2d3c4f161cd75
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive external linking suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://maypoin.ru/wix?keyword=the+juicing+bible+pdf
    • http://mjawebdesign.net/matrices_problems_and_answersqclc9.pdf
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/dezukozewamar.pdf
    • http://plsale.pro/rs3_corrupted_creatures_slayer_guidelvcll.pdf
    • https://romixizu.weebly.com/uploads/1/3/4/8/134887474/4686860.pdf
    • http://steel-lipetsk.ru/call_of_duty_mobile_1._0_16_obbx2ol9.pdf
    • https://cdn-cms.f-static.net/uploads/4378382/normal_60446c5fb1a59.pdf
    • http://blog-millionaire.buzz/which_personality_type_is_most_attractivev07uc.pdf
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5ffb89169a313.pdf
    • http://options.expert/how_much_is_a_used_bowflex_wortheq2v1.pdf
    • http://rivalo130.com/sakemakob5j9tn.pdf
    • https://xilazugalalurid.weebly.com/uploads/1/3/4/6/134685369/04a14bc.pdf
    • http://cashbackmoney.info/misuzunofut60ucr.pdf
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/vumuxipeduwaxuwimu.pdf
    • http://springital.fun/83111839358y3m18.pdf
    • http://nekretnine.site/tufutosejumafojutejmvzw.pdf
    • http://tumbochka.space/baxezilujejobugutyoym.pdf
    • https://static.s123-cdn-static.com/uploads/4371248/normal_600651aa4bf26.pdf
    • http://deflecfcvy.best/printable_taboo_game_cardsne6gh.pdf
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/samud.pdf
    • http://maddot.space/varudakewerurevazasi9pncw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_8e6084569a94408c946455b5257ff8e3.pdf?index=true
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_ca7a0b8c0cd848ca9a6f74bcecbc7664.pdf?index=true
    • https://e012ec00-e8e8-475f-a96b-80cab2ad705b.filesusr.com/ugd/3f1139_c3b6b4d1d0b4457ea0ca41ede5d399a3.pdf?index=true
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_27cef7bf83954d0a858f28aed1a9f7a1.pdf?index=true
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_2948ea62bf8a4e578675a49f76fb1ebf.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e901.bin
935db2cc1c64579a4c53f9c51d0ea14e6b0d51b2fc3998040565406c11119b8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 4792 bytes
font_01_sfnt_off0000f93d.bin
6b6773955ec780c503b90cbc6a589915519e6dc8c9985e960b3f338ba23acc42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93D 10972 bytes
font_02_sfnt_off00011eab.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 4324 bytes

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