Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d0dafd6f537f1…

MALICIOUS

PDF

73.9 KB Created: 2021-01-11 01:15:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a8815950ffda053564a33483c543363c SHA-1: 5f93cb2acd0d06d9a8da389b4655982d42a0a0eb SHA-256: b79d0dafd6f537f1420acfa205cf2547302f07e37132182acb2d429b9c507506
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to external PDF documents hosted on disposable domains, suggesting a purpose of SEO manipulation or distributing further malicious content. The presence of a known malicious redirector URL further supports its malicious intent.

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://gettraff.ru/123?utm_term=cocodrilo+mas+grande+del+mundo In PDF document text
    • https://wederubumojap.weebly.com/uploads/1/3/5/3/135393822/8849415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_5fbed9d54dabb.pdfIn PDF document text
    • https://ritesevegozuvij.weebly.com/uploads/1/3/1/6/131606822/6c8054d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375073/normal_5ffa4fd7c099b.pdfIn PDF document text
    • https://bovaxomasomi.weebly.com/uploads/1/3/1/4/131437143/3691853.pdfIn PDF document text
    • https://cdn.sqhk.co/lawikuto/ggdjG4B/fisufugiwipigovokonobamu.pdfIn PDF document text
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/zuvapolunogo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377706/normal_5f8e8f7253647.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fe40b373d9f6.pdfIn PDF document text
    • https://beweluka.weebly.com/uploads/1/3/4/6/134694692/bea938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5fb5a2ccaf768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 5084 bytes
SHA-256: d1fdc5bf1003eea502a313a6c992b6de9742433849ce364667838491b2e71899
font_01_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 11476 bytes
SHA-256: adc0ff687591adc98d8dfd020b991c4dc09cbdefc6b87319b271453debec543f
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.