Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f2dde766f3dc21…

MALICIOUS

PDF

65.8 KB Created: 2020-11-11 20:38:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4962b3a746dae55af5ace320ab833956 SHA-1: 118b319dd326b245815943de154d632f8374d733 SHA-256: 09f2dde766f3dc2153af5341926050c1c4418000aad6a027bba17b1ac374c376
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a link farm heuristic firing, suggesting an attempt to direct users to malicious or deceptive websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack.

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://trafffi.ru/aws?utm_term=diabetes+australia+guidelines
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f8f8f226cd73.pdf
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f97506ecd873.pdf
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/2018308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vuliwisuwig/menopugi.pdf
    • https://uploads.strikinglycdn.com/files/043a5c10-7d57-4499-86e8-548412807472/compare_and_contrast_fairy_tale_grap.pdf
    • https://uploads.strikinglycdn.com/files/f82bb3b1-ea8f-4df6-b558-00d7e1b62775/mafamiduwalarilek.pdf
    • https://s3.amazonaws.com/wewuxuviwar/7724453169.pdf
    • https://s3.amazonaws.com/voropa/80683722828.pdf
    • https://uploads.strikinglycdn.com/files/15715ca6-51db-46fc-bd28-505f505a29af/stanly_county_landfill.pdf
    • https://uploads.strikinglycdn.com/files/46d3e75c-afc3-4a41-bc12-3b8025a5b298/35508802327.pdf
    • https://s3.amazonaws.com/vezumobigodub/manual_for_bernina_801.pdf
    • https://uploads.strikinglycdn.com/files/25492693-7fa7-4221-8b40-c5eb47feb667/monufi.pdf
    • https://s3.amazonaws.com/memul/48914084647.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_off0000c78c.bin
49de89abb300a5bef2869fcc46dae7d74d463e1fd13c113f67f1f2e30c2b9b73
pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 5132 bytes
font_01_sfnt_off0000d90a.bin
f77a2f18846c77d0ab040c31d72f67e2db1663609a4ab61e6a6a0d3969997b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 9876 bytes