Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fdf275c310a48da…

MALICIOUS

PDF

70.7 KB Created: 2021-02-15 13:06:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ecd0324160974a99d95e648008d0c31f SHA-1: fcc59532ebff8de05af0212985e91026ed2e0762 SHA-256: 3fdf275c310a48daaa83be793ee65994863f48497a46fd01d55322e3c63ecc6f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains text related to a 'vocabulary workshop', suggesting a lure. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, strongly indicates a phishing or redirection scheme. No scripts were extracted, but the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=vocabulary+workshop+level+d+unit+4+answers+synonyms+and+antonyms PDF link annotation
    • https://cdn.sqhk.co/zotipimesaza/jaHqges/jivutipusitazora.pdfIn PDF document text
    • http://rekipeva.iblogger.org/anbe_sivam_songs_masstamilan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5fff63bd3cfd0.pdfIn PDF document text
    • https://ripapexogona.weebly.com/uploads/1/3/0/8/130874469/ccf30d910164e6d.pdfIn PDF document text
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/rotaxilekeberes_felipegela_pejanefonuno_xobojofenene.pdfIn PDF document text
    • https://furuvisagibeveb.weebly.com/uploads/1/3/1/4/131453033/kovuput_xigekimidu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/higuqcj/z_tune_body_kit_for_r34_gtr.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/josuguxomopoz.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/1zsJDBZ/8212199843.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/dg723gg/old_phone_keyboard_translator.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafakizukizunof.epizy.com/bleacher_report_50_best_nba_players.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/fomikukipodax.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/72335401558.pdfIn PDF document text
    • http://lesuzikabe.epizy.com/tabela_de_municipios_ibge.pdfIn PDF document text
    • http://dalizavok.rf.gd/42060394956.pdfIn PDF document text
    • http://waraxiv.rf.gd/jamilolidanowe.pdfIn PDF document text
    • http://nadefivetokilak.rf.gd/sesakubirorijipokixi.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_off0000d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A6 5824 bytes
SHA-256: 9921f46477d727e11c779daa4e2c064383e3a706bb6442dd0c33c43604186add
font_01_sfnt_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 9964 bytes
SHA-256: 7d110d6e6cb497a6b5e6a3701b495482b7a39de37f58796306fd539743dac749

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