Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ca4733dfc77bbf…

MALICIOUS

PDF

76.3 KB Created: 2020-11-14 18:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: abf4b3a9481b7ba6556bab7504274074 SHA-1: 8e9e4b3a0c828af25fce2ab50dd95424b9787b05 SHA-256: 71ca4733dfc77bbf217c944fa00ad03f56423a2234e8ef8548002f6a5c8d0328
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various URLs. One of these URLs, https://trafffe.ru/strik?utm_term=movimiento+uniformemente+acelerado+p, is directly embedded and flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=movimiento+uniformemente+acelerado+p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383128/normal_5f8cae25f1f10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f9e8d5842bc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f9ebd8f02245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fa9abf72f198.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/87d1af8b1262300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f9cb7a63251b.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/golepe/16901298840.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/16248681821.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/35442866320.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/47062168662.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/kapojel.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/zifodeviwalu.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/ffxiv_marauder_tank_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/dalixojipet.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/subanajederowumupu.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/mujavanivuxakisom.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/worksheet_on_exponential_equation.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_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 5188 bytes
SHA-256: 36ee59902d884775384367a9f32583f26e6ea00d1a42d9cc2010eb3578987d52
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 11816 bytes
SHA-256: c0efa81bab041b82854fb09b76e9c8d188052c61e1ba5204c777955652d28fcb

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