Malicious PDF — malware analysis report

Static analysis result for SHA-256 308861f4268072f2…

MALICIOUS

PDF

66.3 KB Created: 2020-11-21 19:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d923fbfbc4e8fbc1bb347c092d62caf7 SHA-1: 11feb2705b57399a55413c2364dc59318612542f SHA-256: 308861f4268072f285c603e8d91544c23f4991b580ebd41e8dd9f0e8b2252e36
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF documents hosted on disposable domains, a technique often used for SEO manipulation or to distribute malware. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. The embedded links likely serve to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=native+american+quotes+about+love In PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/kebuw_repana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_5fa39d624b6d3.pdfIn PDF document text
    • https://dufubixapitosig.weebly.com/uploads/1/3/4/5/134503348/9165046.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/lanezo_xusuxuguwikati_raroviz.pdfIn PDF document text
    • https://numuluga.weebly.com/uploads/1/3/4/3/134307024/8239232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f932a3f2765e.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/1440579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5fb7287181520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5f98391794677.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476416/normal_5fa82132e1944.pdfIn PDF document text
    • https://xepuxewezikute.weebly.com/uploads/1/3/4/4/134437058/4302646.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/rawesaragegugar/characteristics_of_historical_research.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/pampered_chef_gallon_pitcher_with_stirrer.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_off0000c84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84C 5240 bytes
SHA-256: f0977b6eb18660b256191e136e8e978fc56745bc51c69eb5f11db168630b1039
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 10228 bytes
SHA-256: 63610982c56dd61777eaf830d1cfa7087fdb3d34ab60080b4af0ab355b039c74

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