Malicious PDF — malware analysis report

Static analysis result for SHA-256 34db82f8c5f08113…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 16:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2336543b1a19ab24616e893708c7cd4a SHA-1: c77319824424295d87449548c1adcc7cc5056e4f SHA-256: 34db82f8c5f08113c5f82040b78da752f5252fcf7ede88e79bcb5480f55b5154
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure the true malicious destination. The presence of URLs like 'https://baarspo.ru/strik' and 'http://lnstagram-copyright-confirms.com/...' strongly suggests a phishing or malware distribution attempt.

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/strik?utm_term=murray+riding+lawn+mower+air+filter PDF link annotation
    • http://lnstagram-copyright-confirms.com/39332615871alhuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497688/normal_6016c10b7705b.pdfIn PDF document text
    • http://italdom.fun/uplay_crash_report_initialization_error_2ulo3q.pdfIn PDF document text
    • http://naturka.space/xirurufizimuvef1c5ep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454424/normal_6027ec7dde491.pdfIn PDF document text
    • http://fsbsiod.com/hot_fuzz_online_freev8u9g.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/risakeruk_ginolux.pdfIn PDF document text
    • https://cdn.sqhk.co/dezuvosowato/pgijbii/wevolopo.pdfIn PDF document text
    • https://cdn.sqhk.co/vomifavafo/0wHhfib/copper_beech_resident_portal_bowling_green.pdfIn PDF document text
    • http://djami.ru/blood_relation_quiz5hjgm.pdfIn PDF document text
    • http://segwaywheelchair.ru/x4_defense_platformde3a4.pdfIn PDF document text
    • http://italywom.space/vuwiglo6gs.pdfIn PDF document text
    • http://xteenware.online/bissell_proheat_select_2x_not_spraying_waterm5ug3.pdfIn PDF document text
    • https://kewidanuratug.weebly.com/uploads/1/3/5/3/135323433/wibonufeji_rexamop_rakesuloz_vavasimejoroleb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://reditavipesef.rf.gd/bojte_se_tmy.pdfIn PDF document text
    • http://zigixukotezu.epizy.com/kerala_piravi_day_report.pdfIn PDF document text
    • http://wewiritat.epizy.com/fumojajafujorefofe.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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 5248 bytes
SHA-256: dbca74b078a34cbf56a1a35f5440131aaafcc0fa4e6b863db5a62d51d739b2db
font_01_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 10780 bytes
SHA-256: a65b62737b3f295d41a06fe6ccda0cee54c6a51d496ca0a371a49526c8874c0f

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