Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc36a8cab590382…

MALICIOUS

PDF

77.5 KB Created: 2021-03-22 20:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 52551d8026ccb7e432117b6c32ed99c2 SHA-1: 9e538828f738e94ccd735a6d5217c9be9fd3f312 SHA-256: 6dc36a8cab590382a3286cdb1d46cae51eac7dec8f547fc76ab2fd91f41f739d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://fokemale.ru/strik?utm_term=hp+laserjet+1536dnf+mfp+cartridge+installation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475197/normal_60589943585c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_6039d31e06001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5fdf0cc03b86e.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/enders_shadow_bean_character_analysis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_6017066f5233b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387711/normal_5fc6ae3091dc2.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/MhjghBQ/kedomokudel.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_to_get_my_maryland_driving_record.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_6038ca8a4bb6c.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/hEygehg/ufo_enemy_unknown_manual_codes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_99e8a0c83ab34db3bafa09419c8ed5bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebb8c88-d8ed-43b2-8338-3c5ee2576867/kaxozivadowowuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86983442-ddac-438b-aa4a-4ce821bacf1a/gewibaxabonavalabive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b38eb-3aa9-4f58-bfaf-c229681d9214/xedos.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_08f93fd401e34aec9b7c602ab3201386.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010baa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10BAA 18728 bytes
SHA-256: 912b9a7e000f0fa0864388ab69d0f2fbba5ddcfc9c407ae15847beaaa46903a6
font_00_sfnt_off0000d2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 6004 bytes
SHA-256: 51ceba02af00e31b5e9b4808e892aaf947b2f12b207b41d6a78a20e4d72893c4
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10620 bytes
SHA-256: 8d8489ec769a77e677e7bd26c3b6159ebd1eb73997f4f743d4fc85f439fbdb84

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