Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a0a500710fbd2e…

MALICIOUS

PDF

81.7 KB Created: 2020-12-26 19:46:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: da33499c1d3af01c329ac8ef1c71d00a SHA-1: e5e18b1b86a0a81d75ed6241ec54a930a0f98217 SHA-256: f3a0a500710fbd2e58fe9688a0f64f2f463691fd14e5e14eaab6009602af8f96
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The document body text is heavily obfuscated and appears to be a lure related to "Musicians friend stupid deal of the day archive". No scripts were extracted, but the presence of numerous external links implies an attempt to redirect the user to potentially harmful content.

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://traffnew.ru/strik?utm_term=musicians+friend+stupid+deal+of+the+day+archive PDF link annotation
    • https://cdn.sqhk.co/pozuwifofub/je0vicB/83494473745.pdfIn PDF document text
    • https://badoguwogodunej.weebly.com/uploads/1/3/4/7/134713378/nemedufifedimad_tiwusilugom_jefadinoxi_pabozetata.pdfIn PDF document text
    • https://guburumo.weebly.com/uploads/1/3/4/3/134322172/5104395.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/jbicgdi/vagogesidenepobiwiguxil.pdfIn PDF document text
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/ratopajokisij.pdfIn PDF document text
    • https://cdn.sqhk.co/xebibugekux/jhaYjat/feisty_definition_en_espanol.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/5523393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5fafee7a97b20.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/duwamud.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/jDhffje/farm_animal_rescue_alberta.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/jlsgeih/fakazelazurujawozamig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_5fb308f86a3b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474987/normal_5fa75869011be.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/feseni/trasforma_in_word_i_love.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/42080833486.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_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 5408 bytes
SHA-256: 50d17171a58bac1ba5541195d59a750a9d809bc8cd10ed788389ac964c176ca5
font_01_sfnt_off00011291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11291 11620 bytes
SHA-256: d4ea78f83f436e5a24f8276dacc2623c993fa9c1f6753ab043ba7956cbdd3e22

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