Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec9edbbe6c503e0…

MALICIOUS

PDF

85.2 KB Created: 2021-05-15 04:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ffb61650f9f6e457c022076acfceaa2d SHA-1: 99ead40da668fe4a8c9c42ac5356c708d9e21875 SHA-256: 8ec9edbbe6c503e0f0ddb556edead7106450227484561b51e61ce126b89e36d0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, with the ClamAV signature pointing towards a phishing trojan. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://dugedepap.ru/strik?utm_term=how+to+influence+and+make+friends PDF link annotation
    • http://ladekepevij.mygamesonline.org/4405263337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417429/normal_5fd0a143acf17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492915/normal_5fe49681597e2.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/2941015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417305/normal_5ffc02f078a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420029/normal_6065032521f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499942/normal_5ffa444461def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fcb4b3c6e4b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490129/normal_5fc72cce8b5cc.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/25511457153.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/tafojelemota.pdfIn PDF document text
    • https://balebapu.weebly.com/uploads/1/3/5/3/135322653/xinuwilajanawirijilu.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/9968309.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/tuvomamodepojol.pdfIn PDF document text
    • https://xizotikozuza.weebly.com/uploads/1/3/4/5/134587863/nalotuvazadolos-dupeledajazoduv.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/goburalisekivafukivonibuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_605b5378c5694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_600d29d3d6b73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8b2f36a73e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/mokilofotokemexapif.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_b33fe3cedb9a44e786c10d5e4b5e66e8.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_c296c4d343664267abe1c986c0b6f85d.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_b26ebbdcb72041cba372f6d255ce61c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/netinuwa/an_introduction_to_statistical_learning_with_applications_in_r_islr.pdfIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_a3ed5ebc2748495089039ad02443dfe1.pdf?index=trueIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_8af826f620cb4435a8255bcf6f220c51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/92444573219.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/27695017223.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 5284 bytes
SHA-256: 1af222e0e894f01d64c6cb0e7fb575012091426fed062d67395e5c09045f4d06
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 10956 bytes
SHA-256: 88f999b5b6edc6803ea611038edb72dbcc3ea6b4089e7af39e0bfa3d491d90ab