Malicious PDF — malware analysis report

Static analysis result for SHA-256 15758fec7af553b9…

MALICIOUS

PDF

75.9 KB Created: 2021-02-27 16:13:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a423076086bdb594f64f09b32ee03ed2 SHA-1: d51bcf0e0fd504c6503ae9bb349f609f6f6ff2aa SHA-256: 15758fec7af553b9b214c108d309f62e4652a96b8c8402cf81ab75e745454c29
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the primary attack pattern involves directing users to malicious external URLs.

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://xajibur.ru/strik?utm_term=how+to.use+a+safety+razor PDF link annotation
    • http://rubewox.sportsontheweb.net/lorinufuwe.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/c588df69d.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/wesulosarabusok_kidovot_gezabovigove_fojur.pdfIn PDF document text
    • http://armada.technology/current_instruction_register_examplenlmhz.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ONhafij/rarevenavudijutejog.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/wisobodoxew.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/noxaguvopadaf-navadunobozexib-woladusilidid.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/bomenimarix.pdfIn PDF document text
    • https://wawulawad.weebly.com/uploads/1/3/4/8/134872625/fokalepape.pdfIn PDF document text
    • https://gavebinakufir.weebly.com/uploads/1/3/2/3/132302735/7338496.pdfIn PDF document text
    • http://cashbackk.site/counter_terror_apk_modo1v4b.pdfIn PDF document text
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/mewizetexot.pdfIn PDF document text
    • https://wolixakeju.weebly.com/uploads/1/3/6/0/136002716/2240e43.pdfIn PDF document text
    • http://magic-world.site/adverbs_of_manner_worksheets_grade_4h11h6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 4968 bytes
SHA-256: ab9e05be5b352ae442d0be64311d309d8dab40ed94000a51befcaf0fd519cecd
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 10692 bytes
SHA-256: 0f0bbe922b4c253272083fd1ff1ecb9f00dcb4b7f9a830faf82492b0dd359a34

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