Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f975231e5d6644…

MALICIOUS

PDF

65.7 KB Created: 2020-12-22 01:15:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cf56212b3e94ab1149f3d653179c043a SHA-1: c8955667955a7071116442ce77a5006181e3f731 SHA-256: 52f975231e5d6644171affe27e88d56ab1f4757f9d268b037a0978145debdd7f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=chocolate+cake+truffle+recipe In PDF document text
    • https://xazusajapefo.weebly.com/uploads/1/3/1/3/131383727/2376966.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/jidigusuritidebeto.pdfIn PDF document text
    • https://wovusowi.weebly.com/uploads/1/3/4/8/134886666/9822781.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/fozibeb.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/2743582.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/jeboxavut-latoxinanesuxi-xenuruxub-rotakirufofoder.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a3af9f-1393-41c7-a03c-bb0718f9b8d9/parkland_golf_and_country_club_homes_for_sale_zillow.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00f8e11f6a41984810e13/t/5fc1bd4018e72e5fdb18cce8/1606532417078/29688450841.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6b1d9403f5353fdbe0a77/t/5fd22001a9eaf43bd85cf5de/1607606273672/sas_survival_guide_collins_gem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4d2d76-58ad-4343-8230-dcdd5d232160/ash-throated_vs_brown-crested_flycatcher.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/36146480095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e5f2cb-f8d7-48ed-8b08-c40b53352ec8/zenith_guides_pathfinder_2e.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/xogotedurujozo.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/jwplayer_video_blob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0751792a-fb93-4e55-b413-9bf89590cc5f/watlow_f4t_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/87704468359.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_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 4892 bytes
SHA-256: bbf0f921af8531df6645fddc1f39f8b4fd3096ae1b9df32bcd2ada8a41e953d6
font_01_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 10316 bytes
SHA-256: 894b2f3d35def24937ab3fe8f40278c8dc67831579ba2831c23418cbbb8efc6d