Malicious PDF — malware analysis report

Static analysis result for SHA-256 232f033145cf3390…

MALICIOUS

PDF

76.7 KB Created: 2021-03-27 09:50:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bb9c227b79b417a36ce2fd9bb80e7569 SHA-1: 644af58fe2c0380e972280ef7ebd77b240383e0a SHA-256: 232f033145cf3390a4005d2f5f7e9ec6b144eb2c337cc540e83c2ece539a9cda
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL `https://lozipotod.ru/award?keyword=apsc+exam+question+paper+2020+pdf` suggests a phishing lure related to exam papers. Although no scripts were extracted, the PDF structure and external links point towards a malicious intent to redirect users to potentially harmful content.

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 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://lozipotod.ru/award?keyword=apsc+exam+question+paper+2020+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5fcc1a214ac46.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/8009355.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/kEjjkgh/putotebajixozaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/xUhcggh/elixir_electric_guitar_string_sizes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_6011bae8747e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484635/normal_6035c44d6acf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fe2f6aea2897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_60356654caa6e.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/jipemisejarewi_lokomisenatava_dubome_zizamorazuzarew.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/fulosobezur/renunciation_of_probate_nsw_form_123.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/79953794556.pdfIn PDF document text
    • http://duvugagaxanawag.rf.gd/bbc_iplayer_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5403661c-0694-4ac7-8555-a620d92fdc1c/poloke.pdfIn PDF document text
    • http://faturorevilovog.epizy.com/let_teenager_try_adulthood.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9abeba-1ba0-40ab-b64f-9c54bb657a51/wobixone.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/modiramuzizagibiboruroko.pdfIn PDF document text
    • http://lojosikol.epizy.com/troy_bilt_rototiller_horse_for_sale.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/kiranuwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbf44e6-0c29-46f2-9021-a4ef3683f5e3/46354546824.pdfIn PDF document text
    • http://mukukukeban.rf.gd/raxek.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/zigatozifujimev.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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 5728 bytes
SHA-256: ba87640878dea718a249a1defe622a5ffb0a31994171a63b8f559d8c919289d7
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 10300 bytes
SHA-256: 0d4563e7e6115f72638b41111dccf3ae29e36262ee2d14260381b0c357cf96cb

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