Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3ae191a04e2c7ef…

MALICIOUS

PDF

58.4 KB Created: 2020-11-25 22:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aaeaa14721b5d9ddbee08bee974aece1 SHA-1: 540313b6b383d792f18dba489c198c682377bb69 SHA-256: f3ae191a04e2c7ef9c77377d8c9e8f52fe38d189db570941c675f3e8455c1e74
156 Risk Score

Malware Insights

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

This PDF file contains a significant number of external links, identified as a link farm. The primary malicious activity appears to be directing users to external URLs, such as 'https://trafffe.ru/strik?utm_term=fox+v1+helmet+visor', which is likely intended to distribute further malware or engage in phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trafffe.ru/strik?utm_term=fox+v1+helmet+visor
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/3301.pdf
    • https://fikuvigobe.weebly.com/uploads/1/3/4/5/134582673/9110339.pdf
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fa35f2fcd57c.pdf
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5f99190bbba79.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sagotomagin/chrome_app_for_pc_free.pdf
    • https://uploads.strikinglycdn.com/files/1959d2e7-fbfd-4b90-92eb-5456f25dc1c9/beta_sigma_phi_degree_pins.pdf
    • https://uploads.strikinglycdn.com/files/aeff16b5-a8a5-4225-8827-cd76b01d69b4/39026957956.pdf
    • https://uploads.strikinglycdn.com/files/6a0b2d69-b147-40fc-b236-337d85c689c4/gixixudodojajaxoxigosek.pdf
    • https://uploads.strikinglycdn.com/files/9a2ac970-a5a4-48e7-8f2b-d4f39d7556cf/ap_european_history_practice_exam.pdf
    • https://uploads.strikinglycdn.com/files/c31db97d-0118-457c-ac83-de05c936529d/26488775041.pdf
    • https://uploads.strikinglycdn.com/files/b29a478f-ddf3-4e61-a3c8-7a63b4125166/vsam_interview_questions.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_off0000a77b.bin
86134dff7b9a0d396f472cc569fcf5d5ea6f55257756ae22d328727414a8e976
pdf-font-stream PDF embedded font (sfnt) at offset 0xA77B 4852 bytes
font_01_sfnt_off0000b7de.bin
c9bd457237032d6428f755cb29a88b97e3cd1f04fc48f3abe978f8460fd4bcc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DE 12056 bytes