Malicious PDF — malware analysis report

Static analysis result for SHA-256 433a78d96da18e60…

MALICIOUS

PDF

74.1 KB Created: 2021-01-06 21:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58349448f539c71fa2c490d44a8779ce SHA-1: 75f2fb599a8526c3144642e693c751dd59ca1e08 SHA-256: 433a78d96da18e607614c9270bba432215a5d5fd9d7a06a4acaffedd5efd1dcc
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 pointing to disposable hosting services and redirectors, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a redirector link to 'gettraff.ru' further supports the malicious nature of the document.

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/123?utm_term=lesson+4.3+triangle+inequalities+answers In PDF document text
    • https://cdn.sqhk.co/fujalapevame/iiYigcI/vojekibomoram.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/OhiYshf/16192663495.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/eVoWibn/fonts_download_iphone.pdfIn PDF document text
    • https://bugigubagide.weebly.com/uploads/1/3/4/5/134586777/xaxikewob.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/5254192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485329/normal_5fe640bd3c27b.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ifogdVl/lawatowotuvewev.pdfIn PDF document text
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/a94a45afb2.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/winepogor.pdfIn PDF document text
    • https://naxaludegefow.weebly.com/uploads/1/3/4/7/134776308/debejugezebekur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f9d01757c3cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5ff4da67627e0.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/game_cabal_private_server.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/94779324126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f61638-d05c-4e47-8faf-242fbf9390b0/powavukul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD807 1672 bytes
SHA-256: cf75f445ceddf67a5388db14875aedd7051ba709f34e9fc6915d7855e50462b6
font_01_sfnt_off0000e039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 5296 bytes
SHA-256: e11671eb81d5728db81043d91e8c449a1e915da097ad80f851981411610eab77
font_02_sfnt_off0000f269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF269 11976 bytes
SHA-256: 4da2f4741abc2b3637a443e20c020e63eee404adcbe5c1aa97a1cb48f121bf88

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