Malicious PDF — malware analysis report

Static analysis result for SHA-256 29410a1f87377141…

MALICIOUS

PDF

64.2 KB Created: 2020-11-25 11:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 362fd1e9c35d98ab0d00825eae0d0096 SHA-1: ed5ee118b68911a83709fd727ad477f1736aacf3 SHA-256: 29410a1f87377141df2b8a0820d949b4771e10986e1fd6f46c12fe5850dfe9a0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'trafffe.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as 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://trafffe.ru/123?utm_term=endocrine+system+review+and+wordsearch+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4373248/normal_5f9494947137e.pdf
    • https://cdn-cms.f-static.net/uploads/4374188/normal_5f94473d174c6.pdf
    • https://banavodix.weebly.com/uploads/1/3/4/6/134687022/muxuwosiliradono.pdf
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/525062.pdf
    • https://nirorozarijax.weebly.com/uploads/1/3/4/3/134342495/zemor.pdf
    • https://cdn-cms.f-static.net/uploads/4481155/normal_5faf17dfd634a.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f893515c3ff5.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/9772442.pdf
    • https://zomipawir.weebly.com/uploads/1/3/4/8/134899005/pidijibexasave-tawipapa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nilititonawafim/96639945088.pdf
    • https://uploads.strikinglycdn.com/files/41fb4f7f-13a6-4f00-a036-db3a5afe11c6/34921481653.pdf
    • https://s3.amazonaws.com/leguvefu/chemical_bonding_a_level_notes.pdf
    • https://uploads.strikinglycdn.com/files/d41295b0-2fb9-4620-92b4-4157e7b57a35/sekugamule.pdf
    • https://uploads.strikinglycdn.com/files/f80b484d-1258-4b76-b3bc-01dad157043c/anno_1800_commuter_pier.pdf
    • https://uploads.strikinglycdn.com/files/2525e5d5-d699-4255-ba5c-a970ba7f3b1e/mivedudoguxixasu.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_off0000bfc6.bin
42ed861787e59aeebac71706853158574472597f2514742221fb8a07e66dbbb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 5420 bytes
font_01_sfnt_off0000d224.bin
8bcfdce7d33792f69079112a5b28cb6b0588537b28dc91d0075f0acb52d683ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 9756 bytes