Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98ae3436937a5a2…

MALICIOUS

PDF

76.4 KB Created: 2021-04-03 01:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4a924f619517f8c2a1f0ef9ec7465450 SHA-1: dde7d3d161f0b89e6237c027dbc58597d218f751 SHA-256: c98ae3436937a5a2b6c8eaf40c7c435d5f20e8a2127f5b539c5b838401c23e62
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to attract traffic. The document body, though heavily obfuscated, appears to be related to job syllabus information, a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=ap+grama+sachivalayam+jobs+syllabus+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/widafopaj/jighjgG/59999573492.pdfIn PDF document text
    • https://bubosetew.weebly.com/uploads/1/3/4/5/134515161/kopav_monejufopawal_poxojaki_diziroxa.pdfIn PDF document text
    • http://falozuk.22web.org/15516239250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451930/normal_5ff9b31e31cc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_60325e611f7b0.pdfIn PDF document text
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/jiguramunexuvimiwuwo.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/gihhBhi/durogufopufaxixiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60637e760d9e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402488/normal_5ff1ae383c7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_6034545726d3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_cffa77bd97794166be43f791c7645fae.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_f4bf0b1a018d473eb0c2a6cbae406799.pdf?index=trueIn PDF document text
    • http://fesenobonirizu.epizy.com/dawuvasomep.pdfIn PDF document text
    • http://gipomafusabakix.rf.gd/what_is_the_legal_age_of_consent_for_marriage_in_the_us.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_bb9d5b1d29d743dbbeeef6a11417f838.pdf?index=trueIn 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 6208 bytes
SHA-256: f664b1fe598cd8bcd1d1076fe862575de5827c0be30bc89198935e7f710ca0cc
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10572 bytes
SHA-256: 5eeb274ed6a5647158f5b9dd26d66ef5951cfc95456b601a101eff2d5d9eb472

Open this report in the interactive analyzer, or submit your own file for analysis.