Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49d319a6534cf9c…

MALICIOUS

PDF

72.3 KB Created: 2020-11-27 11:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b1257effc096cecd9b8667f82203021 SHA-1: 1e165adcefa39a4d723dd6fc4d1df799d63ba4e8 SHA-256: b49d319a6534cf9cf6f3a9df2b2a65a20443a058fd6e0f0d5cc8d8a7271b9973
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, with critical heuristics indicating a link farm and external URI usage. The presence of numerous Weebly and other hosting service URLs suggests an attempt to distribute or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malicious redirection scheme.

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://traffking.ru/aws?utm_term=waku+waku+japan+tv+guide
    • https://sefariduzaki.weebly.com/uploads/1/3/4/6/134665623/xatusokuwipakok.pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/bomunosawukub.pdf
    • https://cdn-cms.f-static.net/uploads/4481836/normal_5fbdf04ccc491.pdf
    • https://cdn-cms.f-static.net/uploads/4420903/normal_5fb9b986d88fc.pdf
    • https://cdn-cms.f-static.net/uploads/4417988/normal_5f9da3b0e08a4.pdf
    • https://sudikejejipow.weebly.com/uploads/1/3/4/8/134879182/9591332.pdf
    • https://rupulosulokor.weebly.com/uploads/1/3/4/7/134773135/d8351776e29b335.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f893c0616439.pdf
    • https://gekanabedo.weebly.com/uploads/1/3/4/3/134318260/02b4554c52bc652.pdf
    • https://cdn-cms.f-static.net/uploads/4375694/normal_5f958d6d30596.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fa6523ec5563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ronenitevodo/repozaza.pdf
    • https://uploads.strikinglycdn.com/files/0ca3f390-27d9-4c10-b7ce-f67ea4cc506a/xakeperoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce1.bin
33cc8c7fb1e86649a706fa9ee240352d864b601505112ced764729afe2209710
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 4500 bytes
font_01_sfnt_off0000dcc5.bin
8392ca3bcf761fe6316b5473ce969be8b53d08077e80068e057db3c574e8ddc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 5128 bytes
font_02_sfnt_off0000ee76.bin
ce7ef22f8dd10b46cbc22ed8f107685b1643057ffa8cb131f68b846bae5bee9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 11032 bytes