Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3406a013ee8cf11…

MALICIOUS

PDF

70.5 KB Created: 2020-11-25 20:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ab4b1df950c74ac279fbf691b5f2b7a SHA-1: bdaf07f64abb41313fc042cd01786e59d384fe91 SHA-256: a3406a013ee8cf11e83f0518660e4eccb771c3daa3b01fbaa749307bb052ac88
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 as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'trafftec.ru', which is suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or hosting malicious content. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=life+of+pi+guided+reading+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5fa9fe6690197.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/8719099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_5f991f382447a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eacf918-2592-47ec-bbb6-120c6948a98c/30301442109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/793b2187-c6e1-4007-9a0a-661144fbcb34/43126308253.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/cae_practice_tests_plus_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d169f4-b17f-4438-9955-199aaa41fe34/1397559334.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/28769060399.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/best_free_solitaire_app_for_android_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/gobigi.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/business_development_roles_and_responsibilities.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d2341c-c335-4c27-8eed-116a0e15c1e9/dipewofugedix.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/cassette_to_cd_converter_software_free.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_off0000d754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD754 5244 bytes
SHA-256: 29bdfb0bf1044fa5656b50423778af0b7a56329730e0b8d79ca7716f6aebd282
font_01_sfnt_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 10420 bytes
SHA-256: 674a723b3dfff1c3e4d38b13525416b721bcf14c4141539f53956173587fbbc1

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