Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25aab4e2d4b094…

MALICIOUS

PDF

70.5 KB Created: 2020-11-20 12:18:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ededbe05ff6eaa9f1c3692a7b685760e SHA-1: ec4ed35fddc93dacbb6448c437d4449b746d56a2 SHA-256: 4b25aab4e2d4b0949a78b0f041fca684539cbc1dcf211799e7f9177f061445d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'nfl playoffs fantasy football cheat sheet', which is likely a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=nfl+playoffs+fantasy+football+cheat+sheet PDF link annotation
    • https://tuvexora.weebly.com/uploads/1/3/4/6/134618292/kafapimetotuwe.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/rewininakov_gideb.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ligewajinaxi.pdfIn PDF document text
    • https://xukolewijox.weebly.com/uploads/1/3/4/3/134320036/zajulunirerema-kufaderajovil-popot-zutoberaxu.pdfIn PDF document text
    • https://guvodirafed.weebly.com/uploads/1/3/4/4/134475496/8adb28eecda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/light_reflection_and_refraction_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/mobunel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada60ccc-7a8b-4dbb-9a8c-961147ee7d28/5_letter_words_that_start_with_gl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb9a579b-3f02-47f0-b640-e5eeb202a8ec/34955216456.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/sirius_cybernetics_corporation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f3ee47-d3d8-48fa-9276-7aeebf4aef06/shell_shockers_hacked_version.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/lumitelevoxivisebogamo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 4960 bytes
SHA-256: 00a7c839d9084140a2f532fa8010e0ee69fd0e6c655bc60c643f60a5bdc20e57
font_01_sfnt_off0000da7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7D 10616 bytes
SHA-256: 558d862d0591ddc37d690f244aae64ecf583bf8e6ba842df606373de4e9c1c93
font_02_sfnt_off0000feb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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