Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a548af9e25dd313…

MALICIOUS

PDF

78.8 KB Created: 2021-06-10 21:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3aabe5815be1630627cead4d8ad19415 SHA-1: efbc5259b7b566d863c31991a50f956399b6a700 SHA-256: 1a548af9e25dd313c33f5bae79c7ae3c2ff40ca5e0852e488afc19348fa3329d
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'gimoguvi.ru', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a link farm on disposable hosting, likely used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/123?utm_term=free++baloch+liberation+army+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6025156da54b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393190/normal_5ff0dcb2e6091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_5fe66db14ad18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5feec99d905d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_601b356155eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601bfc51981b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490722/normal_60141f86e80be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450641/normal_60263c8e40afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449410/normal_6037db204a50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402963/normal_606cbd9864a8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_60294f636314c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_6054ec1373676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fcd8c4115fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481271/normal_602ef54a86256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144492033/6876485445.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/ingilizce_ders_kitab_cevaplar_8._snf_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b342ee5-01e0-4db7-a834-36aa96475d3e/xolajejupovadojefojotaxoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c52f09-6ddc-4f91-a5e1-bf4d13cc9e94/ikea_pax_wardrobe_sliding_doors_instructions.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/49762772488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd13052d-cf32-4d77-b985-8fabd348486a/1986439657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86743b9-3836-4ad8-8e86-2516b484dc04/05_jeep_grand_cherokee_electrical_problems.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/49858117608.pdfIn PDF document text
    • http://pudomasepok.pbworks.com/w/file/fetch/144711537/how_human_activities_affect_the_environment.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5048 bytes
SHA-256: 00cfabd792cce0098a8b0d8cb20baef0cd7ad64c943e7b3aaa248ada04c32060
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 11416 bytes
SHA-256: d508cf14aca1621b2be74f634910a01071f77538f08b89a20755599a94a0a14c
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f