Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f13fb85cfb5e86f…

MALICIOUS

PDF

93.9 KB Created: 2021-04-06 02:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f334f0ef6a3cc8d788819ff57d298151 SHA-1: c421327120eb58d078343a5a99fb4d54300bde9f SHA-256: 7f13fb85cfb5e86fa41943eb173a5b12734a411244556f8be036302bf7b3488d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL list suggest it's designed to redirect users to malicious content.

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://crophysi.ru/strik?utm_term=ergo+360+baby+carrier+instructions
    • https://cdn.sqhk.co/petebeki/jnFzieI/lusezinepum.pdf
    • https://cdn.sqhk.co/jotenitix/GihVife/xuviwuzibogaduwezuwu.pdf
    • http://xuduxuv.iblogger.org/refezeparosefunameguvu.pdf
    • https://cdn.sqhk.co/mufipofunup/Vjdichc/tapitetabetamulegise.pdf
    • https://cdn.sqhk.co/lajawawinu/hjihcfk/dipiratefoxexolotabibeke.pdf
    • https://cdn.sqhk.co/xelalizogim/pRgdvxz/ludogorets_fc_livescore.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_2b7508a8dae644dcb5a1c412b893e533.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_bf5b3ccaeb984b1d9210a089326c79b2.pdf?index=true
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_fefbf26022ef4c53ba623f9ff914b8b6.pdf?index=true
    • http://dusetelonuzaj.epizy.com/britannica_discovery_library.pdf
    • http://gajedimigifupet.epizy.com/gikadenopugagen.pdf
    • http://pezuxegoweniger.epizy.com/dogix.pdf
    • https://uploads.strikinglycdn.com/files/687bd9f7-fab2-40a9-a90d-27ed1db30ffc/72744640580.pdf
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_0f231ff2a8f342e1b37a96986a107b6a.pdf?index=true
    • http://tirajeril.epizy.com/javogujurejo.pdf
    • http://rogoxeruf.rf.gd/vereto.pdf
    • http://delitareba.rf.gd/1693897469.pdf
    • https://uploads.strikinglycdn.com/files/d212334a-4b58-4f60-88b9-b205e59588b7/how_to_read_vishnu_sahasranamam.pdf
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_271a2afcf40c4a3d9457143bdda0ae5b.pdf?index=true
    • 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_off000123ff.bin
ab38b506f7845e4ef84700e34dcd7e9b0a447696a3f38e2cc0804cf183a86d66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123FF 5476 bytes
font_01_sfnt_off000136a6.bin
12a13fd8fc886fb763964630a9eb25334b41864f6c377109b4b12b7b14c1ae3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A6 11372 bytes
font_02_sfnt_off00015c9e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9E 4324 bytes

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