Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ecf594dd3272da…

MALICIOUS

PDF

85.4 KB Created: 2021-03-20 21:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1e86ac9b020c32ea285b131ece09c08f SHA-1: 107f17107bd0d9bbe2c8a0ba1574492a42c52b4a SHA-256: 86ecf594dd3272da84bf5bc13d62a357627265f30628537d8440f682c2f4223e
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards a phishing or malicious redirection scheme, potentially using techniques like spearphishing attachments to deliver the document.

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://leonvi.ru/award?keyword=la+la+land+audition+sheet+music+pdf+free PDF link annotation
    • https://cdn.sqhk.co/majumoros/aiahc8C/ballast_tank_inspection_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/zodenizekija/hhhjg0L/surah_shams_full_with_urdu_translation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_601cbfc60212d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6037182c1a1ba.pdfIn PDF document text
    • https://jagusidenoz.weebly.com/uploads/1/3/4/9/134902343/xezamevupen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454977/normal_5ff6842c2dd00.pdfIn PDF document text
    • https://cdn.sqhk.co/fabadipub/jhjhgh4/no_limits_night_racing_track_days.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_604162254051b.pdfIn PDF document text
    • https://vipopatovosidop.weebly.com/uploads/1/3/0/7/130775456/9546b6ab5d.pdfIn PDF document text
    • https://sovivagigeb.weebly.com/uploads/1/3/5/2/135296454/gapanej.pdfIn PDF document text
    • https://lanilemu.weebly.com/uploads/1/3/1/3/131381326/sudigu.pdfIn PDF document text
    • https://bedapidipofawif.weebly.com/uploads/1/3/2/7/132711979/5180335.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f2d129016ba9411e8fec6e469c824d15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef0d2cd-a73e-4ddd-8268-e3340e4a1900/9815419372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baa00e5f-c12b-4334-b7d5-99a2a36d8bd5/array_data_structure_interview_questions_in_java.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_4fbc970d47b447deb55f15d677bdce29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ad399c-cb78-4e26-8199-0d79f87b1368/wadatejuner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/983db191-d8a7-4330-9c6e-4d202904a9fc/how_to_use_a_vicks_vaporizer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdc5212-89f5-490f-b07f-a89d90ef8082/fumefekojobekelozonu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 18088 bytes
SHA-256: e9eceaf7ddff30764b840708be777459d80acec23df453a3daa427837b2966a6
font_01_sfnt_off00010ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF3 5336 bytes
SHA-256: d5a8cae74c8e1ac1bfb5a6b2df941f4efef051bc608be4df0d401b3d9e6a5346
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10620 bytes
SHA-256: 7ab709a6bb890bad3e1c4fa4b151b4557433e189d182e3202791db24c70045ce