Malicious PDF — malware analysis report

Static analysis result for SHA-256 974d1e34148ba61d…

MALICIOUS

PDF

88.3 KB Created: 2021-04-11 07:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18eab5eb3b5890ce69881db8ea784c07 SHA-1: a17e945fe9c7bc5f1eec71c0e3fd4be403dd37a8 SHA-256: 974d1e34148ba61d91c60635effda09fce89e6edc796bed9550ac2485ec25a5a
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, flagged as a link farm, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=resettare+roomba+780
    • https://cdn.sqhk.co/jizapamilizo/ghjieie/nulurotugepelisupomopa.pdf
    • https://cdn.sqhk.co/zapakolozu/hciehdu/planet_pilkey_app_not_working.pdf
    • http://fonagifegelu.iblogger.org/obteno_dos_alcoois.pdf
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fce9eb32d7e7.pdf
    • https://cdn-cms.f-static.net/uploads/4422382/normal_5fd1dc331152f.pdf
    • https://cdn-cms.f-static.net/uploads/4449000/normal_606ac3676aba2.pdf
    • https://cdn.sqhk.co/fejisedetu/gcJUcgf/bunekeragi.pdf
    • https://cdn.sqhk.co/jojikoxazew/cajhyBo/endless_run_lost_oz_unlimited_money.pdf
    • https://cdn.sqhk.co/molewekane/oTriiqS/gukeloj.pdf
    • https://cdn.sqhk.co/resilano/owNihhg/linomutawa.pdf
    • https://cdn.sqhk.co/dediwifime/XqOI889/zaxemupomugu.pdf
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5fce7b5ad293a.pdf
    • https://cdn-cms.f-static.net/uploads/4455639/normal_603d12c769f13.pdf
    • https://cdn.sqhk.co/xuwadezab/dbAhajo/19990713333.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_212cb8b23bcd46baa1137df0e6793494.pdf?index=true
    • http://budibisila.epizy.com/anxiety_disorder_free_download.pdf
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_1f0f0e0aa593466ab9e1cb004dccd909.pdf?index=true
    • http://wikeratofi.epizy.com/70029050549.pdf
    • http://wuguwusilabibax.epizy.com/american_burger_menu.pdf
    • http://jarobifuxoletow.rf.gd/lekeguxakinugakamuxosubel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c9b.bin
dd057058e0f4b26165c2b8ba0206d255be801d50283c577bebf9358d4998eafb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 4996 bytes
font_01_sfnt_off00011d91.bin
166fb0e667e66d4065876a2f6868256ba88cf24e7dd95b3dab65c6dd378ecb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 12252 bytes
font_02_sfnt_off000144a1.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144A1 4324 bytes

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