Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde89a5ea9acf014…

MALICIOUS

PDF

59.2 KB Created: 2020-11-18 18:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4d4fe57f2591c205caecd794f3a7ec26 SHA-1: 171f47db5d1bc18f1ec3d22bed4ea0f048742883 SHA-256: fde89a5ea9acf014ddf6b206c3804d0550b28be47e8f9e6d5ffcc5527638c9b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially phishing-related. The presence of a large number of external links, many pointing to Weebly and f-static.net domains with obfuscated filenames, strongly suggests a link farm or redirection scheme. The wkhtmltopdf authoring application and the embedded junk data in the document body indicate a likely attempt to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=dragon+ball+xenoverse+2+toppo+god+of+destruction+mod PDF link annotation
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/duvitare-sadesadireva-mesoxij.pdfIn PDF document text
    • https://rusizugijenu.weebly.com/uploads/1/3/4/3/134340450/wadiwagavanefowat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fb3fe7baa4a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411918/normal_5fa392f0dedc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f9b35ddda239.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/bomifabipi/carolina_panthers_injury_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/witchery_cat_familiar.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/54774645017.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/51593535631.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/94049199481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b6d4ad-bbfa-4215-82ef-c3f819c47e43/62434102356.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/25067926600.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/65838447768.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_off0000aaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAACA 5876 bytes
SHA-256: fef3561a88cdaa98447d73001c6219180984ecda1d483cbc71e7c5b0d974bf62
font_01_sfnt_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 9732 bytes
SHA-256: 5c0cbd5718772482c2d3eb87cdda31d9f85839f96a53a4c23a0953a7e7a803b2

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