Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a191a4fbc7894d…

MALICIOUS

PDF

77.0 KB Created: 2021-01-31 22:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 709b44801539c9507f6af9ae42ae3a54 SHA-1: b426f54012745bda904e9596078f599148895401 SHA-256: d7a191a4fbc7894d72872f3f3ddc217509c52ee87b297b57a9d489338f9f8985
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable domains and link farms, indicating a probable phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=edge+of+tomorrow+mimics+design
    • http://mosdendy.store/gerikeripi4x44e.pdf
    • http://wawewifebobojum.22web.org/common_cooking_terms_worksheet_answers.pdf
    • http://frut-tree.site/blackberry_passport_install_androidfaex3.pdf
    • http://mercelus.xyz/podudirotovuvidogesenijo1pa.pdf
    • https://cdn.sqhk.co/soxuwutitaw/gjieiaB/xikawiron.pdf
    • http://lifeit.pro/drt_be_yaynlar_ygs_matematikwj4if.pdf
    • http://klossheff.xyz/51743974215sjkgc.pdf
    • http://salonvarna.com/paremazr4us.pdf
    • http://yourdesk.website/make_ice_cream_cake_pops147e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rerinago/fijusunudev.pdf
    • http://zumewozuzetarun.epizy.com/zitelodezewadutako.pdf
    • http://nelifofufotilep.epizy.com/kovewebuzaroduxawobuli.pdf
    • https://s3.amazonaws.com/tometubufimopim/10467619565.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f021.bin
37c92ddf71513f88ed4a3e591504f48f5561a56a889b803a26afda5e48c18f76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF021 5148 bytes
font_01_sfnt_off000101b0.bin
e1f0123c1e836b3fafb8cda62e5a7f9984a80dbe95b6bc28005238ff09459b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B0 11300 bytes

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