Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7768fc7589f9e6…

MALICIOUS

PDF

74.5 KB Created: 2020-11-10 14:33:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b716842318d36760bc0ae5984ecb5b00 SHA-1: 143527f2940e2be8824fa94e603e0636e9137030 SHA-256: 7e7768fc7589f9e66e5379a683955210be6d5dfe01d450a20033a354a130f066
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious domains, suggesting a link farm or phishing attempt. The presence of a URL related to 'Logitech usb headset microphone test' indicates a lure to a phishing site. 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?keyword=logitech+usb+headset+microphone+test
    • https://cdn-cms.f-static.net/uploads/4378406/normal_5f9473884fc47.pdf
    • https://pedugosiv.weebly.com/uploads/1/3/4/6/134622687/1652862.pdf
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f8d07ad5d126.pdf
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/3608468.pdf
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5f8e2510553eb.pdf
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5f926d1f92e1f.pdf
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f8cbb27a638a.pdf
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5f9765edc28dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/630a8efb-3d9e-416f-8da6-0f0e2caa2c0b/cardboard_samurai_helmet_diy.pdf
    • https://uploads.strikinglycdn.com/files/03513461-bdb0-49cc-928c-d4a29cec8972/do_svidaniya_translation.pdf
    • https://s3.amazonaws.com/newopetusam/wegigivobifulomuk.pdf
    • https://uploads.strikinglycdn.com/files/e3e44aed-aed3-47ba-b9de-81fe25c9098a/39009893333.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_off0000e661.bin
23376025687424336f4cdd352b13b63f6b5fac3a1c066c27ad3ac20d25548dd5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 5536 bytes
font_01_sfnt_off0000f90b.bin
3e19e8630e3a60ff7af7527f9924b9184323b558df76e9827f72c7a72206a361
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 10552 bytes