Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b98465d5db5e06…

MALICIOUS

PDF

72.0 KB Created: 2021-02-17 03:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 51bf096495ed0e6278d11a04ad7fa452 SHA-1: 352687b1571ae6f95b68e5a85c94e61227f4892b SHA-256: 36b98465d5db5e0656f5447d346c78800e64872a9a16cf791379c021013f501e
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a potential phishing lure related to 'Army information paper format'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the presence of multiple external URIs points towards an attempt to redirect the user to malicious content.

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://seumenha.ru/strik?utm_term=army+information+paper+format PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379236/normal_5ff501f394893.pdfIn PDF document text
    • http://montana-media.com/83388980400cqexu.pdfIn PDF document text
    • http://rexifiru.iblogger.org/secure_anonymised_information_linkage.pdfIn PDF document text
    • http://prechambre.xyz/wizezesonarajozamebd5yd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374517/normal_60194dc11dc40.pdfIn PDF document text
    • http://graatorama.space/death_from_above_1979_moonlightrrah0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386087/normal_5fdbe0f20093a.pdfIn PDF document text
    • http://frukt.fun/nhl_21_ps4_gameplaygf5s7.pdfIn PDF document text
    • http://womenalikumat.22web.org/17089937896.pdfIn PDF document text
    • http://superheatbelt.xyz/sevezupedutenuxeraluhbwjf.pdfIn PDF document text
    • http://sonoxusa.iblogger.org/8926843542.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wapolijo.epizy.com/how_to_become_a_caregiver_for_family_member.pdfIn PDF document text
    • http://sivokag.epizy.com/advances_in_sheet_metal_forming_technologies.pdfIn PDF document text
    • http://nitesegu.epizy.com/migikaripakipamex.pdfIn PDF document text
    • http://jezagap.epizy.com/natadokafimiwasoxegov.pdfIn PDF document text
    • http://wufizomofoduzin.rf.gd/majojuzifenogebidoka.pdfIn PDF document text
    • http://pusevim.epizy.com/dugukivinite.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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 4928 bytes
SHA-256: 51168d489c85dffcce0bcda46826d309da8ed928be51698dbb97627640104a65
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10580 bytes
SHA-256: d72a03a2952840d7825604893cd8d813edc0c479a767d4b63a6986d422d1e8b1

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