Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd7c782809c1195…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 06:55:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e04b82c8d13e80ca2907eaedae91ddcd SHA-1: be2fbf5a61da87a5e46f5255aef31453f45a933c SHA-256: 3bd7c782809c1195c54d9e71bc1aa778cfa12a64800d299983c02de2d9a8de8b
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document body, though truncated, suggests a lure related to downloading a textbook, which is a common phishing tactic. The presence of numerous external URIs, many pointing to disposable hosting or link farms, further supports the malicious intent, likely to redirect users to a malicious download or exploit site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://jacksth.ru/award?keyword=accounting+and+finance+for+non+specialists+9th+edition+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/tefegegesuxe/lgcSgi6/nanukedusorawutubede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_602b930a787f4.pdfIn PDF document text
    • https://cdn.sqhk.co/radojiga/Li6igS1/15792741921.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/jaxijih/hitman_hokkaido_sniper_assassin_master.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ibidzhh/sijuma.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/FghifIB/homescapes_ad_vs_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_60399a11d7d21.pdfIn PDF document text
    • http://labuwiza.iblogger.org/rugalaxagenuvovezul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mufizepumu.rf.gd/limusijabekazevi.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/zelebatimasuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9cefc7-a2e6-490d-9d46-063ae42d5ce1/60249746884.pdfIn PDF document text
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_caa24ca788664380b4a50b486358a676.pdf?index=trueIn PDF document text
    • http://womefobusefox.rf.gd/70925665425.pdfIn PDF document text
    • http://muzafevabuma.rf.gd/background_bike_photos.pdfIn PDF document text
    • http://danidagibi.epizy.com/form_24_return_of_allotment_of_shares.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/79947398993.pdfIn PDF document text
    • https://b2f3f1fb-4f3f-4d5d-be65-f5b10dce6288.filesusr.com/ugd/735189_11a2c4d3a8b24ddc8348f3680615821e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b8ea75-55c8-48b4-b9fd-24b8e8bafaca/old_school_funk_music_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340da263-d5c6-495d-bbc6-5493378a2947/xuten.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_602b28bdd77842ae9b196c3a3224247f.pdf?index=trueIn PDF document text
    • http://rixuzomobe.epizy.com/kadibekuvobokida.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 5536 bytes
SHA-256: 7cde575639d72a1b81b05fb2e43de83c1e28e7c31a03fe50f533ffa2709f4d5f
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10464 bytes
SHA-256: 0dbe6f35d18a69a8a364d472a12d58329eeeded3dd40b76ed74d224ed4d582e4
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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