Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ad5fee060af270…

MALICIOUS

PDF

96.7 KB Created: 2021-03-18 21:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3810df54e71affb2653f014c32b9835 SHA-1: 52b0f3ab3543ef212733197e06f28a9eadffe0e8 SHA-256: 20ad5fee060af2706c585ca79e2b1feea2a511e4337a9fb245446e929a16751c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://gimoguvi.ru/wix?keyword=skyrim+magic+build+guide PDF link annotation
    • http://goproits.com/315390515879hodu.pdfIn PDF document text
    • https://cdn.sqhk.co/bojiluxenome/cTjdjja/64037309453.pdfIn PDF document text
    • https://risegexof.weebly.com/uploads/1/3/4/6/134661868/9285319.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/iaahdxu/bojulabeborumom.pdfIn PDF document text
    • http://ipatovaalena.ru/fire_emblem_birthright_talent_guideszv3o.pdfIn PDF document text
    • https://cdn.sqhk.co/gugirejol/cy5ciiR/12121952318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_6038e07f923d7.pdfIn PDF document text
    • http://zaxanoxejem.iblogger.org/dumolifojupidufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382974/normal_5ff989c6e891b.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/fowilepiwizisiw-difijukulafum.pdfIn PDF document text
    • http://wowezixuxaxu.22web.org/10700083263.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/cLhbjce/givudemol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_6001149680de6.pdfIn PDF document text
    • http://erse.xyz/reinforced_concrete_design_worked_examplesxh1nu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xifabopopotesa.epizy.com/winatolekipolowiwalotis.pdfIn PDF document text
    • http://vejawojifig.epizy.com/afterglow_gamepad_xbox_360_driver_windows_7.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_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 5492 bytes
SHA-256: 4dd9ca3d79f5beadfc9cf845ec54618aa36d7a6ed5e4c1f6da45e98ab057ee7a
font_01_sfnt_off00014af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF8 12156 bytes
SHA-256: 29d4d9df02fc97f6da4155f820316e605e6d4b427bb620fd3dff1945732d13e7

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