Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0334e34911a7d62…

MALICIOUS

PDF

74.9 KB Created: 2021-04-03 07:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 974bd6709fc8258135495119b79398c5 SHA-1: 225981d00e2fa810a85b1988f1a12bcb1b3dab11 SHA-256: b0334e34911a7d62dd2e28d72bc5e6fe08ffe64cfe3723231ee97f1e460b531b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with heuristics identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt 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://bologen.ru/award?keyword=apparel+production+process+pdf PDF link annotation
    • http://obuv-kozha.ru/cinebench_r20_windows_76cteq.pdfIn PDF document text
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/dogatasogiwe-powiwisimeput-zejej-lepojebivig.pdfIn PDF document text
    • https://pulijapejupexeb.weebly.com/uploads/1/3/4/0/134041872/2469800.pdfIn PDF document text
    • https://nododekevage.weebly.com/uploads/1/3/4/7/134733794/d9be4.pdfIn PDF document text
    • http://circulyarkadigital.xyz/97804981112c1fro.pdfIn PDF document text
    • http://idem-peshkom.ru/54226892259m67xq.pdfIn PDF document text
    • http://wesaremujoworu.22web.org/aladdin_hollywood_movie_songs.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/1eac0a7c2094bc9.pdfIn PDF document text
    • http://fukefaz.22web.org/wish_clauses_rewrite_exercises.pdfIn PDF document text
    • https://tifelekaguli.weebly.com/uploads/1/3/4/7/134744440/jarixu.pdfIn PDF document text
    • http://tetufava.iblogger.org/54780439338.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/dogefige.pdfIn PDF document text
    • http://cardio-active.site/free_metaphysics_booksd68q1.pdfIn PDF document text
    • http://lotsmen.com/chinese_characters_fortnite_nameen5kw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7c3ee4-0a61-4b53-83c9-9a883409fff9/17816330769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a1be38f-bb88-4904-b4fb-282968cd3296/83901132281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e396651-fe2d-41c1-a854-7d1c97727047/tulekexago.pdfIn PDF document text
    • http://rarovuvoj.epizy.com/journal_bearing_design_handbook.pdfIn PDF document text
    • http://bapomeguradoka.rf.gd/ashes_cricket_2017_pc_game_utorrent.pdfIn PDF document text
    • http://tixumupugenatum.epizy.com/winuvefupizinobarudu.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_off0000e9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A8 5140 bytes
SHA-256: 95c6e95bb870396260f604132ce8e43486ff8c0e94dfa54845706e09fe3b8481
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 10436 bytes
SHA-256: 45f99167b63b184d4eefa5995d3e386109056c40189fb6824133b415962835cd

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