Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff6ad96a7be3103…

MALICIOUS

PDF

64.7 KB Created: 2021-02-28 12:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4806acc375761b749a790c98139bc67d SHA-1: efe8bbfb83ceb6df1823e6987546942a094bd4ef SHA-256: 8ff6ad96a7be3103270b076cd3d20762f44b09a5253f01b86088e56dd907919a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=more+wise+or+wiser PDF link annotation
    • http://todayit.pro/womebemujabejatamunoz7kayb.pdfIn PDF document text
    • http://idem-peshkom.ru/html_to_api_githubzxwll.pdfIn PDF document text
    • http://wisitens.online/ritutajuxarogobunuvadirugd6fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_60357c7f5f103.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/posuruze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_5fe51046a0faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5fd943dc44e94.pdfIn PDF document text
    • http://krym.today/fuxetedabobizvwqn.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/22791516659.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/wazixazeruvanuvopijajaj.pdfIn PDF document text
    • http://car-test.pro/lights_blast_projector_troubleshootingdc9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_6037c8b673766.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/boxujetanonikuv/elvis_presley_cant_help_falling_in_love_piano_sheet_music.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/jinebetusatudiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/lulirufi.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/what_is_boundary_condition_in_ansys.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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 4532 bytes
SHA-256: 8adee574cb8a70ee99c3e616298c4d65a203bb39bce5b7330334af236a6d4f93
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10532 bytes
SHA-256: da9ae99093152d9c8b7e3b785392ea6e4db4ef5d9daca92cfd33b2ee2874241a

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