Malicious PDF — malware analysis report

Static analysis result for SHA-256 812f3745683fcc0e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-06 15:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 158884540bc9534d310ab372e3611e60 SHA-1: ed6e2b8fe0ef378175b625ea6b9aabc36d83bf40 SHA-256: 812f3745683fcc0ea539f4dd89a144449edf9cf50e9ba82ccbf91314b55cf5de
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classification and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous external URIs, suggesting an attempt to redirect the user to download further content. The presence of a 'download button' heuristic reinforces this malicious workflow.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/123?utm_term=canon+430ex+ii+manual+mode PDF link annotation
    • http://fiziwovana.22web.org/alhagi_pseudalhagi.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/63194479577.pdfIn PDF document text
    • http://zuvixomajav.22web.org/72542347170.pdfIn PDF document text
    • https://cdn.sqhk.co/xerejijasoma/SULihwn/fogexulazipesiputajesela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502563/normal_5fe8ea0525f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_60324ea7aaf65.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/xurozivunuw.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/mafigiposadufi.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/igenh7Q/plus_messenger_app_free_download.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/65374726027.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_6015d66dca5b9.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/bbc52379.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/fcc376153416a48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/130071d0-4ef3-4525-9b76-dc8ad468851b/92985452864.pdfIn PDF document text
    • http://tutivute.epizy.com/idh_angola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b409930-9227-438a-a8a6-77073aeffc7c/2013_dodge_avenger_se_rim_size.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/86804254765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e7bd900-e7a8-4ad6-89ad-27f49ada1cbe/milowilojin.pdfIn PDF document text
    • http://lozadubevapoke.epizy.com/sikonezad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486bb6b3-5b93-49f2-a260-f39e9c08e5e5/gepoxavodumetilezup.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_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 5064 bytes
SHA-256: 9d30231bfd4d9d03de347bb47957c3fc52390d319c3740c8f50df62b89a893e7
font_01_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 11540 bytes
SHA-256: fefd6dafbff45d8e14732dd0280083df389c2ac4a15b2136a0a1e3ec7662d8a1

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