Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0d35c634755031…

MALICIOUS

PDF

80.5 KB Created: 2021-04-03 16:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b179d91bb93911d55839c984a304db48 SHA-1: e94afd298231097dafb431ce159771b59ecd8a2c SHA-256: 2d0d35c6347550312c938c9af8ffcf91628e85a8c7e8433bd44887accb3e5519
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malicious content or phish users. No scripts were extracted, but the extensive link farm is the primary indicator of malicious activity.

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://bologen.ru/award?keyword=stay+at+home+mom+daily+schedule+pdf PDF link annotation
    • https://rixeludabigadak.weebly.com/uploads/1/3/0/9/130969597/a5b68e74e46b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_605efb3dc9f57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366647/normal_5fe3bda023fb7.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/iaHggjc/super_meme_soundboard_2020_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_606338fda936f.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/1KhjAbh/euro_truck_evolution_simulator_mod_apk_free_download.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/59497137198.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/bSrhbje/love_letter_for_her_on_first_anniversary.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwunikuneg/egehh30/wariralijarinepasanuxo.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/nemawazijijujesadezo.pdfIn PDF document text
    • https://vezudarelewik.weebly.com/uploads/1/3/1/4/131482962/gozij-bufepeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449183/normal_5ffb4c95c6ec6.pdfIn PDF document text
    • https://warajepujevofi.weebly.com/uploads/1/3/1/8/131857140/ce28f.pdfIn PDF document text
    • http://disupiwalu.mypressonline.com/65681555453.pdfIn PDF document text
    • https://cdn.sqhk.co/dimasemi/ib136hi/fanatomiluw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_605c0b6cac293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9ce924-c70f-4feb-ba4a-e2a0e59507e2/nutrition_diagnosis_terminology_2020.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/makalah_biota_laut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/214d0b2e-41fd-4f3f-b8f9-2cda1363ba12/13944531591.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/appendicitis_perforasi.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_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 5504 bytes
SHA-256: 43ff038efce23a3ed43847208e4f7534ee4893b679dfca1ab01c2a9225e4241a
font_01_sfnt_off00010e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 11120 bytes
SHA-256: 4ba6273a5e1e4651c7c5b22a9d17fa53a8c5b43877df2289b4c1d63987eb5263