Malicious PDF — malware analysis report

Static analysis result for SHA-256 2becfcf376995856…

MALICIOUS

PDF

67.0 KB Created: 2021-02-26 11:49:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 61f40ce20bfbdb6b4e301fc73b7b203f SHA-1: cddf4e71d215fe80608f881f760bf23a6f372120 SHA-256: 2becfcf376995856b90f116a458808cbf1299b971c0621edb9bb2e62ec519f2b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate setup for deceptive purposes.

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://mezovuduw.ru/123?utm_term=learn+to+read+music+notes+for+singing PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483089/normal_601a1e170a2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_600fde786d4c0.pdfIn PDF document text
    • https://cdn.sqhk.co/lirotigi/hbOghib/telugu_love_bgm_ringtones_2020_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sudizatase/aCheOic/cowboy_caviar_made_with_zesty_italian_dressing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_60381da30e725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_60329925c4e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_601e3fa47194d.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/gflgejd/archery_champ_2019_master_challenges.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402718/normal_600345e5c7d86.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/jjdnjSt/nojubuxukedigewujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_601602d44272a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/95943144357.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/xasibobalo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/bawidopoxib.pdfIn PDF document text
    • http://vapoborino.rf.gd/chronological_resume_format_word.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/pitalokenufidimisajo.pdfIn PDF document text
    • http://fovatuda.rf.gd/libro_la_culpa_es_de_la_vaca_parte_1.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_off0000cb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1F 5252 bytes
SHA-256: 1dd7c59435f013d6464796e6ea05ec3c7329e9984e864babff0ce10f2e76a8ef
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 9940 bytes
SHA-256: a4a7e3b158adcd02ca55bdfb666fd2c2886dccf35e0ce78372bb68c0f3d6dfa3

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