Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc9d0f71f536a5b…

MALICIOUS

PDF

71.1 KB Created: 2021-04-01 19:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7c4260ecbf718485cb0c7104d8c7dd24 SHA-1: 6ff154bc2aeeeb804bbc2dbe67eb72e000b26796 SHA-256: ddc9d0f71f536a5b5d0fae13bf0f43f0634f4ebfd302d46c4955c7a3a868869c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or trojan delivery mechanism. It contains a large number of external links, with one pointing to 'seumenha.ru', suggesting a potential SEO spam or phishing lure. The PDF structure itself is complex, with duplicate object bodies, and the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/wix?keyword=2nd+amendment+desktop+wallpaper PDF link annotation
    • http://esmoney.site/lulumexalaligoxat17sq4.pdfIn PDF document text
    • http://tamakar.tech/how_to_turn_off_jandy_valve0id7y.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/13d7c95533.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/zawewozejopel.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://duvikexa.weebly.com/uploads/1/3/4/7/134709262/rujidajujenanol_fodisafo_kofef.pdfIn PDF document text
    • https://latuzeke.weebly.com/uploads/1/3/4/8/134884471/7552551.pdfIn PDF document text
    • http://shoop-ft.ru/does_costco_have_ninja_foodi98iee.pdfIn PDF document text
    • http://iglivesupportteam.com/20920398181ukpo6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_a05fd9f4a21c4ff5b7447a3ce413b023.pdf?index=trueIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_6029c12bb7b64ab89a401d6b91a83ffc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd18d46d-3dad-45a3-af0f-dd71bdd2b209/vesofulasajuvaru.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_c5ecfea4b1034621ae41c2764d9b530c.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_c74f1fb1d22e4fb085bd7f890103ae34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d582e9-8b4c-4063-81d8-45547614e9cd/fifth_third_bank_mart_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b151b368-d8c0-434a-af35-faf32f2fc39a/42364767354.pdfIn PDF document text
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_034f29ed5e1b400495a0eb3a5d0b4074.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/vuwaripebumubezukigadazof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dff3160-b4d4-4c02-b287-279567bfbab8/andrew_loomis_how_to_draw_the_head_and_hands.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_fc41d912a5424426a4688c90ce8bd9c6.pdf?index=trueIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_cf816c30c2bc4189a933d2b5b8f3790c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a43862-019e-4ecd-b645-60b3747e7bc1/fojagosuxobojodabudubeta.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/strongs_concordance_111.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_bba290c01e2a4c9ba7bfc1d313fb5468.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_dcad2a5ff08b4f6e983938e370af68e0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 5296 bytes
SHA-256: 6b9de05c007349d2d5daecb185e5b700cbdb96e41e695a1cc531109955782de2
font_01_sfnt_off0000e92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92F 10940 bytes
SHA-256: cd41861efa0fa50d9bb8173bea33f7f91bebf1a13be97f446461a9e07a30a335

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