Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de0ff2816e258fa…

MALICIOUS

PDF

78.0 KB Created: 2021-03-06 11:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a09f83b4df25246c77ac89ce00dafb52 SHA-1: a5954b8e35eaceb2f67aef77407346e74a9bc2e2 SHA-256: 8de0ff2816e258fafea664e4b6b596ee9a0e126bd3fa71fee8da7038114ec2b9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to leverage embedded content or exploit vulnerabilities to redirect users to malicious sites.

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://dugedepap.ru/123?utm_term=the+challenger+sale+barnes+and+noble PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366050/normal_6041a169858eb.pdfIn PDF document text
    • http://yandex-dostav.ru/75291373753l6cdr.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/ez2WhoI/gmail_app_for_windows_laptop.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/biretoxezonirup.pdfIn PDF document text
    • http://chambrehub.xyz/messenger_lite_app_store8wdxv.pdfIn PDF document text
    • https://bipixexomalexu.weebly.com/uploads/1/3/4/3/134349320/lujuxakekepufis.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/8jgieJ4/28245199178.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489058/normal_5fc830b65cf20.pdfIn PDF document text
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/vubazalef_xozelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_603636c16ba3d.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/5hjLaif/geometry_dash_free_star_levels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_602729c4eb5d6.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/sutulegekevifaku.pdfIn PDF document text
    • https://jeletizasi.weebly.com/uploads/1/3/4/6/134640559/guzifulajasaw.pdfIn PDF document text
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/c1b65c880.pdfIn PDF document text
    • https://menafemudiwifog.weebly.com/uploads/1/3/0/8/130813668/5459952.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_4da600ee973f40b08656eaef7f1c249e.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_9905e25a44b9453fb1c2b7b1fe2cf6cd.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_675184b7d1c14416916e0e646b387a0c.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 5288 bytes
SHA-256: ac7e2302d13e3bf1c0792443820b9f511c9e27a0ce89e5a56f1284e30e482b39
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 10928 bytes
SHA-256: 0718a30fd98fa382de6478bd3828118642296f1c9c55e623ee352d251debaf52

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