Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7797deb4fbba1d…

MALICIOUS

PDF

79.5 KB Created: 2021-05-24 06:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 174ee0b2b4aa32128f660c7bf68bc4c6 SHA-1: 9f30faca9fb4130951a05243ee46f1f208789ca8 SHA-256: ae7797deb4fbba1db90f99ceda283ad5082376903848ec539ddfdf765c567254
186 Risk Score

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 0.9995

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://seumenha.ru/strik?utm_term=convert+1+cl+en+ml PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420029/normal_6026360c082c0.pdfIn PDF document text
    • https://wimofitadaxota.weebly.com/uploads/1/3/4/3/134362004/d4d4203b.pdfIn PDF document text
    • https://wupifikuzokure.weebly.com/uploads/1/3/4/5/134529023/f1a1ff.pdfIn PDF document text
    • https://nagagixibedixu.weebly.com/uploads/1/3/1/6/131606435/5175502.pdfIn PDF document text
    • https://palokeligiz.weebly.com/uploads/1/3/4/4/134496709/1452530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_60091c787125e.pdfIn PDF document text
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/7065101.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/6ea69a4ee8770.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/8409668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496193/normal_5fca6afabbe1a.pdfIn PDF document text
    • https://lareduna.weebly.com/uploads/1/3/1/4/131453109/vubezuni.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/kudefem/pafer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a066f065-bddb-4142-b0a2-a82da28ca53e/73018295700.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33a78d7-706c-4026-adb1-270c5c7d1dd0/60207579032.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/kuruxemuxafifixoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77ddee8-ebee-4fff-a2d8-1b7702f0d63f/42617328088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72aaba54-cc9e-4c57-b984-b7adff6e30ed/jigeruvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e95eb86-a468-4aee-b40f-94e56dd7226a/nizavovewab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe2d019-3d5b-47fc-85a8-5bc9527a61c7/17754863548.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/gupuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ca51a4-0a02-49f9-afce-9e9a5013ff5d/seinfeld_poster_george_the_timeless_art_of_seduction.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/54642344894.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 4972 bytes
SHA-256: b5e5b7c98ba1b71f729a7d5ab4b4ab682d6e148953b2ffa831b6352729b589e3
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 4572 bytes
SHA-256: 3f8002381065707b2f9b8dad1eacedcf83461af3fca46c739669b861f7204b03
font_02_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 11452 bytes
SHA-256: 04a95efb2dfd62e6158da0c0181d3b88a885d6698947e53dbf457c823172c991