Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c00ce9693a5fc6…

MALICIOUS

PDF

63.7 KB Created: 2020-11-19 05:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d529d43107b2d1f8164993564efe9149 SHA-1: 1dd1d529e98282212053f9921e37a8458673df94 SHA-256: 81c00ce9693a5fc66980a3e8aad6cef5f7b306205c7f0bb634680b0abff8d407
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=lord+of+the+flies+pdf+download
    • https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/bulotelemuf_guxoxagi_belonetuviwipo_raposaf.pdf
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/vezipotatewuk-xipivajakibewot-vetulisa-duxonegi.pdf
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/xelagesavutefu.pdf
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5fa5b1b5c869d.pdf
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5f9a4a5d3b0b1.pdf
    • https://ramaxuvezida.weebly.com/uploads/1/3/4/3/134327775/sinigavelisas-jegiwowudagako-jefufejuzot.pdf
    • https://nanezafukixepa.weebly.com/uploads/1/3/4/5/134526153/4616481.pdf
    • https://cdn-cms.f-static.net/uploads/4417208/normal_5fa9bcd2af6e5.pdf
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/4841e2c74.pdf
    • https://tuxonojetivap.weebly.com/uploads/1/3/4/4/134437157/6c888.pdf
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/9940586.pdf
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5f95ec395fea7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/73b7a941-60a7-4a3d-a739-dcf7a8e92b5b/60455093559.pdf
    • https://uploads.strikinglycdn.com/files/f0a0d515-84ca-46b7-8304-dd568e8cce1d/mebojudas.pdf
    • https://uploads.strikinglycdn.com/files/4cdbe0cc-519e-41a8-b768-718d2355ce96/99339351946.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd0.bin
e445e7ae75d37bea8f86d8e17ba7627241023acdf1f8cd80104874c41a96ac35
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD0 5160 bytes
font_01_sfnt_off0000ce71.bin
15c33b6c9f8f36444a93f535f10dfb15d6cbafb0288b160eb120096c2cdacf06
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 10340 bytes