Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f074de10e0907c…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 20:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 62b322a4154c3ebeb8d7841ed5cdfab8 SHA-1: bb0a2d3bd5eb3665c2f9225480b53b58ea397d34 SHA-256: 77f074de10e0907ce83e9c1a8b27c7a4b9069e70fbad73e615cf70901d8df275
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for SEO manipulation or distributing malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded links point to various domains, suggesting an attempt to spread malicious content across multiple hosting services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=rogue+lawyer+book+2 PDF link annotation
    • https://xetupowo.weebly.com/uploads/1/3/1/3/131382232/pisew.pdfIn PDF document text
    • http://riwuveroxuwox.66ghz.com/kenmore_freezer_troubleshooting_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/cJUJFgf/woot_deals_and_shenanigans.pdfIn PDF document text
    • http://xogubafirugufa.iblogger.org/deltran_battery_tender_plus_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/gizapakoni/diejqaw/here_we_go_mexico_city.pdfIn PDF document text
    • http://mananeje.66ghz.com/xagagov.pdfIn PDF document text
    • https://vodazifuja.weebly.com/uploads/1/3/4/2/134265633/5a15344669f2c.pdfIn PDF document text
    • https://cdn.sqhk.co/tefazaturar/cifiegd/29759967526.pdfIn PDF document text
    • https://cdn.sqhk.co/fasegibuniz/e1moLjj/border_patrol_agent_job_qualifications.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/8473066.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/3hjhcje/56471559848.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/50826700979.pdfIn PDF document text
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/mamerurupon.pdfIn PDF document text
    • http://bopofefolinaw.22web.org/john_rawls_veil_of_ignorance.pdfIn PDF document text
    • https://xubafema.weebly.com/uploads/1/3/4/4/134447535/1d0c1b6d471aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://povujijizota.epizy.com/el_cuarto_de_atras_resumen_largo.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/space_maintainer_lepasan.pdfIn PDF document text
    • http://kitivej.epizy.com/63095469816.pdfIn PDF document text
    • http://funixeja.rf.gd/gelor.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/self_appraisal_form_sample_answers.pdfIn PDF document text
    • http://dipulitexaxuz.epizy.com/american_standard_champion_4_parts_manual.pdfIn PDF document text
    • http://zefawosejek.rf.gd/bibevevunofizerajameji.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_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 5212 bytes
SHA-256: 35f1e571ffd29878dbec602ff97aa8cc7329c3a2095e22b7450921f531f7539d
font_01_sfnt_off0001074b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074B 10676 bytes
SHA-256: b4c4fc91caf24f247ac987759af52201adfabbc688ef69b9b341f220e15ece94

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