Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b75ff586dc8995…

MALICIOUS

PDF

87.2 KB Created: 2021-04-11 04:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 72ad8b59bf676026dabf3abc7b29a8b8 SHA-1: 772c66d149b6b24420a984d1ee92c1cef43b39b8 SHA-256: b3b75ff586dc89951ae98d2de240df46e67c79824c2fc47cc624549d6b986045
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious websites or to manipulate search engine results. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its intended lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://leonvi.ru/strik?utm_term=the+maze+runner+ending+song PDF link annotation
    • https://leludexubivavij.weebly.com/uploads/1/3/1/8/131860378/3239632.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/033bb90db.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/gofinopodazuwibutoso.pdfIn PDF document text
    • http://puzemapulozuw.22web.org/29116975158.pdfIn PDF document text
    • http://tavajan.iblogger.org/92098666518.pdfIn PDF document text
    • https://lorafapewokaxan.weebly.com/uploads/1/3/5/3/135342596/fozugiwudela.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
    • https://s3.amazonaws.com/nemafu/define_canon_music_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd71ce0-8c67-428e-ae83-02aced76f42e/malenajiliwobu.pdfIn PDF document text
    • http://dozudafufu.epizy.com/research_topics_on_business_administration_and_management.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4b56a1-8f64-4469-b139-83f336364b4e/intex_sand_filter_pump_winterize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19707417-526e-4da2-a03a-f0633484c362/nawokodunito.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/renuralojigunonufidi.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/2010_jetta_se_owners_manual.pdfIn PDF document text
    • http://derizarage.epizy.com/15937247935.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/38427731288.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/blood_bowl_2020_team_builder.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/a._c._t._c_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205c3fb6-6fef-4764-9e89-aef59e9d0252/bokitaxujiwaderaretafimi.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_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 5008 bytes
SHA-256: 950e4b3c9db656bf82051c7eb053f7f7865b1c1963697b6eeee0184660a8c9d7
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 10240 bytes
SHA-256: a6b262c82608c7a505009bcd2f1341045a1485ba92024b1997847197a977dc9d
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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