Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3428f7ff4e8cdf7…

MALICIOUS

PDF

79.1 KB Created: 2021-04-20 13:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 30aad00dbadce484c762681b8fa060c0 SHA-1: 5b424f38f54e9a1731c4e7bf56c952facf61e4e9 SHA-256: d3428f7ff4e8cdf776786590fc5f3bf14a3b395530630b863c042f6de5e7143e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://maypoin.ru/strik?utm_term=solucionario+mecanica+vectorial+para+ingenieros+estatica+8+edicion+beer PDF link annotation
    • http://paselon.getenjoyment.net/how_to_make_covalent_bonds_carbon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_5fd9dd1ba5fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_6043ec0d1ecb4.pdfIn PDF document text
    • http://moshon.space/gifukinadoposap7did.pdfIn PDF document text
    • http://ig-soft-team.com/reretevc27z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_6041cdb1aac4f.pdfIn PDF document text
    • http://trokot-shopnew.online/sulujuragefeteduap70e.pdfIn PDF document text
    • http://zozuwax.66ghz.com/malokefemapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449185/normal_5fcca05975cbc.pdfIn PDF document text
    • http://fisidunetozusi.iblogger.org/macy_s_bedding_size_guide.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/dilavovewa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_6042ca01ef0a6.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/just_already_yet_exercises.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/xapidajovaji/juvoxakukesisedipigik.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/chirugali_songs_com.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/air_manager_apk.pdfIn PDF document text
    • http://tawaxinazaka.rf.gd/biogeochemical_cycles_of_carbon.pdfIn PDF document text
    • http://sujaroganufurez.rf.gd/6577460364.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/descent_1st_edition_monsters.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/rebawi.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/buccaneers_injury_report_week_5.pdfIn PDF document text
    • http://dufobirufo.atwebpages.com/odyssey_text_robert_fitzgerald.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_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 5892 bytes
SHA-256: 4f2461bff2f024efb47a3eb3c02453d2cbda466003dca21ca3b38d48a8156fe3
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 12252 bytes
SHA-256: 82b31e5d8355319183449d909c9bca8a9d6515f1fbb67853e152b9d7a2592536

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