Malicious PDF — malware analysis report

Static analysis result for SHA-256 8358b3a8d09a86b5…

MALICIOUS

PDF

62.7 KB Created: 2021-02-05 07:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5c99fa4944d20ef47fe455bdf84b0dbd SHA-1: 970214bb43cf964c764ea5782e780849451e9843 SHA-256: 8358b3a8d09a86b5f914f382f1fdfe4232cc1ca7b0225199dfc19cab49d9fcea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is structured to host many external links.

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 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://maypoin.ru/123?utm_term=xf228+wall+mount+manual PDF link annotation
    • https://cdn.sqhk.co/wezopexa/5hgHM5d/riwekatogofifal.pdfIn PDF document text
    • https://cdn.sqhk.co/nezazexador/feifjjI/1040161499.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/jAiehgX/simple_cake_recipe_with_biscuits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5ffa82cd88c1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fec784748c47.pdfIn PDF document text
    • https://cdn.sqhk.co/kapidibewomu/haridW2/rollercoaster_rush_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/tikisudolo/3jBNb1n/blade_crafter_2.pdfIn PDF document text
    • https://cdn.sqhk.co/potekovibe/YWibtD8/asteroid_bennu_update.pdfIn PDF document text
    • https://cdn.sqhk.co/nivatasob/kigjcnd/idle_space_tycoon_hack_apk.pdfIn PDF document text
    • http://kiguporut.iblogger.org/ecology_quiz_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ff32538316c9.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/nijudow/voxug.pdfIn PDF document text
    • http://vetarobafawuk.epizy.com/zoxexuka.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/bugajaruxobudalatinurana.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/48186967778.pdfIn PDF document text
    • http://sexikiti.epizy.com/brother_printer_utilities.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/43651911718.pdfIn PDF document text
    • http://notalopelovawu.epizy.com/46735387982.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/gomunaz.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_off0000b88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88B 5032 bytes
SHA-256: 0447900b888756d424f1ce432e6c136c24d22b8e58a537465e3151354228caae
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 10236 bytes
SHA-256: 0d44e374500853204413a317bd36fd359ce7b5bd0a59ca7587ff7653fde536a4

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