Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8924e0605ddb19a…

MALICIOUS

PDF

74.4 KB Created: 2021-02-16 08:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f7b1f3c6e96a2902f70e10ebfc168a9a SHA-1: 7e50070ebab86bffda71a75a8c5593efc0928988 SHA-256: d8924e0605ddb19a5d3129b9a3550e9fbc91cb34a13f00689a2f2e49ec6b2b56
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure for free PDF content, which is a common tactic for distributing malicious files.

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://bologen.ru/wix?keyword=read+the+name+of+the+wind+online+free+pdf PDF link annotation
    • https://cdn.sqhk.co/lutugivaje/hcijFMW/14574668501.pdfIn PDF document text
    • http://dompodklyuch.com/introducing_interval_notation_worksheet_answersplll2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_60118977d2339.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/LgjbWPz/kotuzejuduriroluwidefav.pdfIn PDF document text
    • http://takudogifox.22web.org/35509592509.pdfIn PDF document text
    • http://bio-ita.fun/payback_2_apk_indir_cepdemzr4e.pdfIn PDF document text
    • http://toteganutiv.66ghz.com/77851513465.pdfIn PDF document text
    • https://cdn.sqhk.co/kerametunal/jfgjhbR/streamlabs_obs_overlays_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/3hi8Kji/exoplanet_archive_eu.pdfIn PDF document text
    • http://eglo.club/gegawawenok6aum5.pdfIn PDF document text
    • http://present-mag.ru/hidden_valley_ranch_recipes_hamburgerslfrnl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5fd04cae9d514.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/ihgjhdD/39409311635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd7d39d00d0c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viwuleraxukopiz.epizy.com/vojobexoxulunosumejipama.pdfIn PDF document text
    • http://fewufewidi.epizy.com/who_is_ariel_daughter_in_ever_after_high.pdfIn PDF document text
    • http://sekusasumoda.rf.gd/approach_to_patient_with_fever.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_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 5200 bytes
SHA-256: 9542d583a5574916ca298a6e02b681649a990ddba898731e6b7a75ffbc55ef09
font_01_sfnt_off0000f8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BB 10336 bytes
SHA-256: 86a712236641f7d179e78e5164349ffd733e638039304dc1bf33652bda7da82a

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