Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cb83840326a3d7…

MALICIOUS

PDF

78.4 KB Created: 2021-02-21 02:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7091f4baab1b666f0ed26be070659f3b SHA-1: 6d8f736b4999a1e801b0124bc44839678589678d SHA-256: b6cb83840326a3d7fecd1e099d3482228254f42c6f81c07311b189386bd3c87e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to search keywords and application names, likely serving as a lure.

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://baarspo.ru/wb?keyword=netgear%20nighthawk%20ac1750%20vs%20ac2300 PDF link annotation
    • http://magicwoolshop.com/77129990240r2tj0.pdfIn PDF document text
    • https://cdn.sqhk.co/xiwogoxozoxi/jjeiagf/metal_packaging_corp_of_new_york.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/jusevepaderunex.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/cessna_t182t_performance_specs2icrx.pdfIn PDF document text
    • http://myyshooop227.site/506210036132f2zf.pdfIn PDF document text
    • http://xopuwigevifuk.iblogger.org/latest_android_version_names.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/IFhaji0/66569754297.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/eijhfgj/yasuhati_with_your_voice_apk.pdfIn PDF document text
    • http://morj.space/godzilla_1998_full_movie_123moviesq0k49.pdfIn PDF document text
    • https://cdn.sqhk.co/zokasejiz/jjRjcWv/griselda_blanco_net_worth.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/boviregedapajeloposemeta.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/icMj0pR/ruzenuve.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/hhii9oh/panda_bubble_shooter_apk.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/wezukep/mediaset_premium_play_apk.pdfIn PDF document text
    • http://finanetut.rf.gd/formation_brancardier_croix_rouge_ile_de_france.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/12874180493.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/clevedon_school_uniform_protest.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/30769283138.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/fosubozumiwepeger.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_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 5908 bytes
SHA-256: 18479996d33949f5dc62bbd2bffc178ee75d211568c8b139c7f30d05db63add2
font_01_sfnt_off000107bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BD 10884 bytes
SHA-256: 55ff687e95408a1ddc089ee66c2aa130cd782d0683366d57efbd6752b4162093

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