Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f047187939e3fa5…

MALICIOUS

PDF

75.4 KB Created: 2021-01-02 07:21:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 67a7e6b12188f21fdce373d804ae09bb SHA-1: bbb68dc37286d72bb470d2158d0d9839b69b6a51 SHA-256: 4f047187939e3fa5da2e5967e29be538d316337f15520cc62bfb96a8f1a8f90f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL pointing to 'trafffi.ru'. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'Chico state college of ag graduation', suggesting a lure to attract victims.

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://trafffi.ru/123?utm_term=chico+state+college+of+ag+graduation PDF link annotation
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/nelode_morovoxeb_fosuno_ligovidipab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_5fe8395ea3cb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f88fce3177ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410448/normal_5fcc5567d0d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377909/normal_5f9c3092dfdae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/baby_got_back_karaoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc03b0a-8ae2-4cda-b4f3-51c6f2850813/85447761805.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/77517356450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8deca34f-afef-4a10-a276-bf1a4276e673/dakufakijogawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626ba4bd-431c-4735-b968-777e0b70324c/wubavuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/vizijajem.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/tirolarotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42147bc6-6910-4a5d-b56d-ec58041a686a/36923001650.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/pujow.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/wefuxizajo.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_off0000e860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE860 5188 bytes
SHA-256: 523efc9ea9b4d677d9972d531c88a9520f52c160ed60acccc113c57399e0ba23
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11520 bytes
SHA-256: 25e9ad7af9e32d5af2c9dca6badb1c5542c761edff8e2f32b303c27c6bdb220e

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