Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20e898ec7eb593f…

MALICIOUS

PDF

77.4 KB Created: 2020-12-04 07:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c998bec5074c84189fd9636b1016d33 SHA-1: dbe871c207d4f61c969358567f3a500daf53ab15 SHA-256: c20e898ec7eb593f294a626875a4ded4ca0a4baf73a3c6b8258a32a834b32cf9
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=this+is+gospel+piano+sheet+music+pdf PDF link annotation
    • https://juxipidupe.weebly.com/uploads/1/3/4/6/134694928/9c2a82df55.pdfIn PDF document text
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/zasug.pdfIn PDF document text
    • https://vamoketuvet.weebly.com/uploads/1/3/3/9/133999376/3196b6.pdfIn PDF document text
    • https://darugagoremu.weebly.com/uploads/1/3/4/5/134588092/7157791.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/e5eddf66.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/mowasafiv-xezuvazirawidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc58302c6d9645836414f06/t/5fc84172dcb5b2607975531b/1606959475172/wevijenatifojoni.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55e961452f90b7f02e78c/t/5fc97d9eee6dcf7e3627d967/1607040415723/panzer_platoon_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc66750f-e230-4b47-ad24-d20d0c04db69/52732620523.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/fisitugusoxidafona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778c4d2c-86f1-4f9d-a451-fed48b290ce8/bawegiratazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c6c1f26-c98d-4654-97ac-67a9ed6c7848/tebitakegipagubeposalar.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/8740911229.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 5424 bytes
SHA-256: 962b3786acc12d050496ca119d244129164e92e76aeb78402f810e9cc0484fb8
font_01_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 10692 bytes
SHA-256: 6eba6d2e1abc2c94095696edad9d568ec67fa3e58bea752c4c40e3188bb8d4d7
font_02_sfnt_off00011392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11392 16100 bytes
SHA-256: 84650fe671c70ac66f3af0994468c9b9feb42d01905b0f030d5781e095ef8e52

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