Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f21b32d550a132…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 01:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 00dfcbb1a65bd79a390297c35dbb40af SHA-1: 5b2c5ab099f3c091f87240e3d7f3ec1dfb11e63c SHA-256: 27f21b32d550a132e18753cd7a4ad3ede5a100d69ffbc81c7bcb8110985958f7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=mirae+asset+mutual+fund+sip+form+pdf PDF link annotation
    • http://rating-bookmaker.ru/interesting_boy_names_starting_with_kgbh0u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_5fe819ee2bdef.pdfIn PDF document text
    • http://vumegebopim.iblogger.org/47974974879.pdfIn PDF document text
    • http://reawont.online/51179885797o4hys.pdfIn PDF document text
    • https://sokowerifali.weebly.com/uploads/1/3/6/0/136053586/vibovepatu_medewuridow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fe5466477000.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/b1ac2565d.pdfIn PDF document text
    • http://snegny.com/auld_lang_syne_poem_writerg8cnx.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/tesor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/wobimavo.pdfIn PDF document text
    • https://a9312a60-cd95-4d0a-a471-91e222afe1c0.filesusr.com/ugd/2d797c_a17b84e6afa9461db433047bd9c67710.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_74efc7923cd6444f9fc8b2f68f1c3bc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezude/the_spectacular_now_full_movie_300mb.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_3cb4b3848f3a4a56b4bbc30e58cf4314.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/induction_programme_report.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_afb4eb2c9a3f4e6196cd21dd58980836.pdf?index=trueIn PDF document text
    • http://nolagevupuxuje.epizy.com/52346509966.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 5192 bytes
SHA-256: 42748ffff497bf9fa4c03b987715c95ea6be5d098762104bed1b271e669d61c6
font_01_sfnt_off0000f978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF978 10868 bytes
SHA-256: cde309c694af3795c9f1f10a7e252b54aee8ae05f3873d3d3a604658f26623c9

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