Malicious PDF — malware analysis report

Static analysis result for SHA-256 81292c5fa1e5cf94…

MALICIOUS

PDF

65.6 KB Created: 2021-01-13 16:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1ffd2a909268c26a6916fb2b28c34fae SHA-1: d5e8ba69025e42d786c6971278fc877a5edcc9ca SHA-256: 81292c5fa1e5cf946a1ef8b636e4afa559d95e47a11e6bb115d1de8e21f98fa0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a mass external PDF link farm, with one prominent URL being https://trafffi.ru/aws?utm_term=clerical+medical+fund+factsheets. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=clerical+medical+fund+factsheets PDF link annotation
    • https://site-1083884.mozfiles.com/files/1083884/50653689909.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/baby_groot_cake_template.pdfIn PDF document text
    • https://site-1175393.mozfiles.com/files/1175393/butapuzurivateniru.pdfIn PDF document text
    • https://site-1171796.mozfiles.com/files/1171796/shave_prank_electric_razor_hair_trimmer.pdfIn PDF document text
    • https://cdn.sqhk.co/koroxofusino/iahaSge/20665445275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_5f97b2f8e5297.pdfIn PDF document text
    • https://jazaxalik.weebly.com/uploads/1/3/4/4/134488577/530009cb079edd.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/f9f0bfef6c93c2.pdfIn PDF document text
    • https://site-1175937.mozfiles.com/files/1175937/unicorn_dash_2012.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/fovezewi/2733863750.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/wevavisegofezibumov.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/22954051105.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/hollywood_ghost_movie_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/metopuradedafozu.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/right_time_of_the_night.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_off0000c3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C8 5168 bytes
SHA-256: 630a64afa94a7fbcd4ad36bc477cf29171abe552a7c4afb5df72c551d8036adf
font_01_sfnt_off0000d52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 10712 bytes
SHA-256: b8dd88173dd0601ee9a7786b12e4d97a775be76b7231abfb725855a3c7beb564

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