Malicious PDF — malware analysis report

Static analysis result for SHA-256 795a0be6a9fafd1d…

MALICIOUS

PDF

91.7 KB Created: 2020-11-14 09:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee9cbed6742dc8193b4385afa8a9e458 SHA-1: 59739c17795980d1fc4a8d09ca54d3a70956e8db SHA-256: 795a0be6a9fafd1dd29d1c65878d9313e9117658c730d9c1ec59cffb0d314c2c
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 phishing attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a likely attempt to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=how+old+is+john+fogerty
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/rupebisarob.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f93a8237f795.pdf
    • https://gupebuxoguwev.weebly.com/uploads/1/3/4/3/134381402/nutixanoruraz-wevewibin-vexafunibot-dobila.pdf
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/wabuge_korejon_dofoxulane.pdf
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/lidijixikekave.pdf
    • https://zuforupixonop.weebly.com/uploads/1/3/4/3/134394080/jasumuf_kinarub_venewulelipejut.pdf
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/148840.pdf
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5fa2147c67d4c.pdf
    • https://wirexefe.weebly.com/uploads/1/3/4/5/134577033/7925142.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/ronagisu_xopukadifukopep_puzozuvarifeb_kapagifobasevip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/74e9917c-814d-450d-a5d3-76100a96281b/guperiritujirepitemubawew.pdf
    • https://uploads.strikinglycdn.com/files/0956fa8a-fcb5-45cc-a8f4-3924f7560987/nilawegabanobe.pdf
    • https://uploads.strikinglycdn.com/files/0632b53e-3e99-47ba-be24-b680cc6bc8d6/xuboniki.pdf
    • https://uploads.strikinglycdn.com/files/e0153647-dba1-4748-af37-885450d5df73/fixinojof.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_off000129e3.bin
29237fba2d35e1d03eff672c0b823ed07499e7b0da177f5ccb66cf926cbfe333
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 5192 bytes
font_01_sfnt_off00013ba4.bin
410b3d39d19be59d0f8f58b49b991e3fd3416def954740c925dfef8e952aa00e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 11196 bytes