Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b342201b67d37e…

MALICIOUS

PDF

73.8 KB Created: 2020-12-09 20:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7fc7ed7cfd0702e3cd2b3029ec8fed81 SHA-1: 779bff018168b35b5f5d6287201019500ccfa6d1 SHA-256: b5b342201b67d37e7d52977e08a30767567e222e0ff9422c0e5482d580508152
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external URIs, 'https://traffset.ru/123?utm_term=barnett+quad+edge+crossbow+review', is likely a phishing or malicious landing page. ClamAV detection and ML classification further confirm its malicious nature, indicating it's a phishing trojan.

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://traffset.ru/123?utm_term=barnett+quad+edge+crossbow+review
    • https://cdn-cms.f-static.net/uploads/4393361/normal_5f9590c3c1451.pdf
    • https://wotilawijuv.weebly.com/uploads/1/3/4/8/134852567/valon_koxol.pdf
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5f9037c792ce5.pdf
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/sukavorofonaremumi.pdf
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f87c29598c6a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e9fb7d0c8f249d40e00c/t/5fc5187d08845d09242c2c7d/1606752382216/keponosaj.pdf
    • https://s3.amazonaws.com/medadele/ferixolemurekunek.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58564f98375720d76c11/1606375512215/career_action_plan_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/ee826b57-d4d7-43ec-957c-d903f1031be5/jobezeropofijekenuvon.pdf
    • https://uploads.strikinglycdn.com/files/2d2fdb94-3f62-4fa2-b5ce-ec557a31cbaa/xivexulilifije.pdf
    • https://uploads.strikinglycdn.com/files/fbdff267-95f2-4827-8b77-0cc2480d70a0/63990399635.pdf
    • https://uploads.strikinglycdn.com/files/af4297b7-7c4f-4b52-8ea7-9c9e996cb1c7/lagetipalire.pdf
    • https://s3.amazonaws.com/bisute/35487205195.pdf
    • https://s3.amazonaws.com/pomaxa/52810315783.pdf
    • https://uploads.strikinglycdn.com/files/6256d7fc-f601-40c7-a10c-f128adfd0094/92587989553.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_off0000e3df.bin
96ec56bf54b441ddf490c353eef903acd26931815636c7f178a52c96f944819f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 5544 bytes
font_01_sfnt_off0000f6d6.bin
6739303b0d993469d91655d67d44feb216548494f6ae74cffb0bcb97aed8cf19
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 10320 bytes