Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b7c9ae4d434120…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 19:24:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3c4c6b27781092d7948bfce36c85e343 SHA-1: b00657bbc3a1fb0a3543d6ceae4513e0807efc26 SHA-256: c2b7c9ae4d43412065379afc510e515dd1edc87b5fd791b6e88af6f5299b6acd
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL leads to a site that appears to be a phishing lure, disguised as a school lunch menu. No scripts were extracted, but the PDF structure and external URL strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://xajibur.ru/wix?keyword=penacook+elementary+school+lunch+menu PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5feee02e84fc8.pdfIn PDF document text
    • http://xivixevikid.iblogger.org/zamufugexedomef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_60104660e0192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487200/normal_601f20fb599fe.pdfIn PDF document text
    • http://tivunuvuzamiguj.22web.org/93385363231.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_5fec2affcb696.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://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_3c1bce19881745a8b26b182e9afcda1c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9714e-b19f-49c8-91a2-d04aaba22e9d/blue_yeti_pattern_meanings.pdfIn PDF document text
    • http://kilatigavof.rf.gd/79547488037.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/30208559465.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/dbx_286s_manuale_italiano.pdfIn PDF document text
    • http://vaxalisuj.rf.gd/31087127683.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/zozefoputa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82bd095-5fd5-4d13-8e27-d83965e9b60a/best_stackable_washer_and_dryer_consumer_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/megalovania_trumpet_sheet_music.pdfIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_f28d8fd215d6484fa0b29772f5aeda66.pdf?index=trueIn PDF document text
    • http://jirovod.rf.gd/electrical_symbols_for_drawings_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e028570-917c-4039-91af-c3a8b536ac14/que_es_paganismo_en_la_biblia.pdfIn PDF document text
    • http://xamixamis.rf.gd/tom_clancys_splinter_cell_chaos_theory_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0fe838-40e6-4313-baa2-1e858551ca90/vonexikonivivanilowa.pdfIn PDF document text
    • http://konasepobave.rf.gd/ranufuwozukigizinum.pdfIn PDF document text
    • http://matufuw.rf.gd/88489812753.pdfIn PDF document text
    • http://zezewesiwakoruw.rf.gd/estadisticas_de_problemas_de_salud_mental_en_estados_unidos.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_off0000f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 5040 bytes
SHA-256: 5f271a7eb38962bb94451a58d6979833ebecb57633a33942ac4be4fac9d68fcc
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10408 bytes
SHA-256: 7a2a15bb490fe62c0b886cef7919e8829f3e999ee48f8c46c0985e0e51c0805e
font_02_sfnt_off000126aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AA 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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