Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c50462c7af54ec…

MALICIOUS

PDF

75.5 KB Created: 2021-02-25 17:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b9cb89624ae83aa27c413c8a8a0227a1 SHA-1: 189b81942053c88c041d66cc8f6418dbeb147858 SHA-256: 19c50462c7af54ec167b06a575a08573727ca8a9cff9a7dde61e4266320926e9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to a printer manual, likely serving as a lure to disguise the malicious nature of the 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://jottigo.ru/award?keyword=canon+mp160+printer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485173/normal_5fdaaae4a5a4d.pdfIn PDF document text
    • http://seamanygau.best/31146627437loy4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ff6909de1e57.pdfIn PDF document text
    • http://bio-ita.fun/manodosuzugl6q2.pdfIn PDF document text
    • http://energytik.net/dibebiresunikavagai4g.pdfIn PDF document text
    • http://soul-felt.com/94818707454lb1dp.pdfIn PDF document text
    • http://pubgmobiie.com/3d_drifting_games_unblockedjvthu.pdfIn PDF document text
    • http://dkblogin-de.com/pudufiwisajejosiwbs41.pdfIn PDF document text
    • http://runmasten.online/wobozavebazawevojigikykskp.pdfIn PDF document text
    • http://sentytld.online/sarkar_3_torrent_downloadaqduy.pdfIn PDF document text
    • http://albl.ru/78114537007vrt98.pdfIn PDF document text
    • http://alania365.ru/semaxijiguir380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_6025b72d000dd.pdfIn PDF document text
    • http://katipef.medianewsonline.com/33751426198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_6031bf18468e0.pdfIn PDF document text
    • http://thecet.xyz/hot_zone_miniseries_episode_guidedxqa7.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://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_off0000de55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE55 5040 bytes
SHA-256: bc99a1d083a8f32f27acbf2a3681642c620ee66d7de98a6e9f931d5dbdff558d
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 10428 bytes
SHA-256: 3d2952f2d26492de3f70101ae05a09980271f935f2cc7040460c95ac3031689f
font_02_sfnt_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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