Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4902aa415f6b69c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 11:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: abf0fcfb8b3c93ccab340885120d08ca SHA-1: 087cfd3e5f5fa5bf48d7e96458d7417a77b0387e SHA-256: f4902aa415f6b69c2f67269cde0b40e5d7abdeb9dea95b0bddd9e1cb3a313d8a
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the presence of external URIs suggests an attempt to redirect the user to malicious content. The document body, though heavily obfuscated, contains keywords related to stock exchange closures, likely serving as a lure.

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 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://ponafet.ru/123?utm_term=london+stock+exchange+closed+days PDF link annotation
    • http://hotita.space/asymptomatic_carotid_stenosis_nice_guidelinesyijwo.pdfIn PDF document text
    • http://hs-life.ru/fobufibaniwefobifcpag1.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/que_es_estar_como_agua_para_chocolate.pdfIn PDF document text
    • https://kosukanawator.weebly.com/uploads/1/3/5/3/135304621/e97355a02a.pdfIn PDF document text
    • http://tomerezadix.iblogger.org/how_to_do_a_tarot_card_reading_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/giEjaji/healow_apple_health.pdfIn PDF document text
    • https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/memifek-jovudigipajen-jipusimug.pdfIn PDF document text
    • http://se-mrush.com/34665488446wkmyc.pdfIn PDF document text
    • https://movakesomerinid.weebly.com/uploads/1/3/4/5/134528648/jerutizon.pdfIn PDF document text
    • http://50offstore.info/ikea_playroom_ideas_pinterestnej49.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
    • http://poluwusafoge.epizy.com/98218668619.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/best_app_for_instagram_stories_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/pojum.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/87985913039.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/vodato.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/81946404312.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_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 5020 bytes
SHA-256: 938ed095a980925b2b23a9d44080d12513484d6a9d791b1566514277c71c85de
font_01_sfnt_off0000f393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF393 11404 bytes
SHA-256: c3770c7f8235bd01b7380fb0d6e542d48a3bbb275d020e563d58aad49b73169a
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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