Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cda1c2855a02ac…

MALICIOUS

PDF

71.6 KB Created: 2021-02-18 02:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7fd87943f4c8300ce7260a20b32d8624 SHA-1: e3104bd20fe9200218e3182b7d9ce0a692cd7a77 SHA-256: f3cda1c2855a02ace58bdedc11e98b9983851c615f64aae8adc9b624a4f0f95d
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/wix?keyword=yukon+fitness+cable+crossover+machine PDF link annotation
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/8812071.pdfIn PDF document text
    • https://cdn.sqhk.co/womibakok/fIxGhec/60590140248.pdfIn PDF document text
    • https://risonozolediwar.weebly.com/uploads/1/3/1/3/131398017/fijiturotowosefuleru.pdfIn PDF document text
    • https://cdn.sqhk.co/xevezele/cMyliiX/earthquake_utah_april_14.pdfIn PDF document text
    • https://ketowijogi.weebly.com/uploads/1/3/5/9/135985413/4081730.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/Tif8Zhj/nukofezob.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/fjagT0G/offline_karaoke_free_download_for_windows.pdfIn PDF document text
    • http://luminar3-download.xyz/zuvenomoton3wo8r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fdf92b1c66cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451376/normal_5ff07bbaa1b7d.pdfIn PDF document text
    • https://rosowimibezot.weebly.com/uploads/1/3/5/3/135392622/544767.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/zodez-fufuxekitu.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/difjbBv/40542521168.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/gjptRii/usa_free_dating_app_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450354/normal_5ff57e72069e9.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/tizowodifi/film_frozen_2_2019_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/crossword_answer_for_of_course.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_off0000cd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 5228 bytes
SHA-256: 4179de0902a81ed10616beec588e189fac97dc07511621fa3d34d8a4f52e8a84
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 10364 bytes
SHA-256: a70dc30ad9fc616e05b11d9077637c4c662aa94e10fd89063dbc6f15285ad7c0
font_02_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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