Malicious PDF — malware analysis report

Static analysis result for SHA-256 495d2cd89a8d9ddb…

MALICIOUS

PDF

92.6 KB Created: 2021-01-28 20:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 251607f3171c757124ee2aa4a6d02230 SHA-1: 9dab99d1fc574a7f9477e60f3074a9ac127fbea3 SHA-256: 495d2cd89a8d9ddb6c2879505587bb7f5f150ac88850746ef704c73e2aa32ac3
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 pointing to various domains, many of which appear to be disposable or used for link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked PDFs. The document's structure and content suggest it's designed to lure users into clicking these links, potentially leading to further compromise.

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://bologen.ru/123?utm_term=medial+and+final+l+words PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449395/normal_5fe1678444daa.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/JieG2a9/lutawimejure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409798/normal_5fda7513cff2b.pdfIn PDF document text
    • http://urro-hu.com/mushroom_wars_2_cheat_enginej62ex.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/7ede7f.pdfIn PDF document text
    • http://helpverifedbadges.com/adam_bruckner_soccern6dvs.pdfIn PDF document text
    • http://reduslim-shopofficial.site/learning_upgrade_add_count_together67imn.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/4ifvJji/medela_swing_starter_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/PjhmO7U/word_jumble_cheat_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/v6jfHWw/cpr_call_blocker_v5000_setup.pdfIn PDF document text
    • http://mon-cmso.best/derecho_internacional_publico_carlos_arellano_garcialb31r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481847/normal_5ff3f443b83e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 4708 bytes
SHA-256: 0af45f65e06380d703efd56408dc579c00200f33c461e89f61f05bc0858fee90
font_01_sfnt_off0001334f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334F 10700 bytes
SHA-256: 6542d3c6eaa0839286d66094b658196b54ad7b9bc90d19f37246c8e8a2c83781
font_02_sfnt_off000157eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157EB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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