Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39f1d3ef9dc47f8…

MALICIOUS

PDF

79.1 KB Created: 2021-02-26 21:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ffa37d339def14ca74147e528b083ee SHA-1: 7b76dfc9991c35df4cf1200c86cb8785abcf9792 SHA-256: b39f1d3ef9dc47f82246058cea974c5a25de77adb76fe7e40e1bf24d9e16e732
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('bologen.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to obscure the true destination. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence suggest a malicious payload delivery mechanism.

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://bologen.ru/strik?utm_term=mainstays+computer+desk+instructions PDF link annotation
    • https://cdn.sqhk.co/tijinujul/hif8pJe/96340087896.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/85215702531.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/AjfXKhg/backhand_serve_badminton_definition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fd98d0f73202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416139/normal_60186ca743a7a.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/dpjeUTF/pocket_racing_drift_3d_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tisumusef/heYhcif/italian_dinner_music_songs.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/arduino_uno_analog_pin_max_voltage.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fed90e8e21da.pdfIn PDF document text
    • https://cdn.sqhk.co/tubefajuvolu/dTQR1O1/fantasy_x-_dash_run_fantasy_space_jumper.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/97105954180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/negonanopix/86230064886.pdfIn PDF document text
    • http://kopolug.myartsonline.com/38810194607.pdfIn PDF document text
    • http://dudowowadoz.rf.gd/mekewakepukapibonup.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/98720934379.pdfIn PDF document text
    • http://jiporeve.epizy.com/dopipobudej.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_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 5356 bytes
SHA-256: e9249444c18a479b4f2f56549c4133fe907e2ba836b3b8f34800ebd35da26b80
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10392 bytes
SHA-256: 6c323c2bfbca5a67817c8fb243542b92b3c1ec636bae1c491f95e66d498baa78

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