Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9da0b4ec5589b2…

MALICIOUS

PDF

72.2 KB Created: 2021-06-07 05:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8d2861a6b57fc509ae07ab17dbc89c08 SHA-1: b6ea08c6f7c76356b013a9ddfb9d2bc22e5862d0 SHA-256: 8b9da0b4ec5589b29cffca598657d1703d15aae66ee72a3d3a4a43a1dc80e370
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 0.9993

Heuristics 6

  • 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 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://synerhu.ru/pbw?utm_term=ak%25C4%25B1n+dil+gramer+kitab%25C4%25B1+pdf PDF link annotation
    • https://katokilewiwimi.weebly.com/uploads/1/3/4/8/134846457/suxugefowovoxe_molerul_tozepeb.pdfIn PDF document text
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/db8e4383f3c.pdfIn PDF document text
    • https://jogemubo.weebly.com/uploads/1/3/4/3/134321321/5518667.pdfIn PDF document text
    • https://lezexogevapet.weebly.com/uploads/1/3/4/6/134657250/873687.pdfIn PDF document text
    • https://rabupipimefife.weebly.com/uploads/1/3/0/8/130874594/2798728.pdfIn PDF document text
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/ziruz_dijejawog_sedoruzefoxar_lipogemokapub.pdfIn PDF document text
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/8746919.pdfIn PDF document text
    • https://zimuwinosozenuj.weebly.com/uploads/1/3/0/7/130740464/pekorezaneji_sesuso.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/3ba1a9.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/5339081.pdfIn PDF document text
    • https://xamivozafuju.weebly.com/uploads/1/3/5/3/135308546/jomila-gojibareneja-zivotifuwelixa-wexum.pdfIn PDF document text
    • https://kexazupaxi.weebly.com/uploads/1/3/3/9/133997339/3650470.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/rowogizamezateronim.pdfIn PDF document text
    • https://tujarabevazedi.weebly.com/uploads/1/3/4/2/134235746/rasuzuval.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/a2aea599-0d83-4ead-84cf-4fe8bb76624d/41724741178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48b2dc2-6e30-415e-af1d-af26a3000bde/how_to_fix_ariston_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d6b09f1-8d8f-4000-a8f1-8fb7eb26bb28/algebra_de_baldor_online_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6a7276-3fa9-456c-a3fb-713111442190/lokoremurunedokituwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3561fed-28b7-4bbd-8f4b-e71ea10a2a3c/senobimajilirokolenule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c022ba-cdc6-4e74-aea8-cebcfe09b380/quadratic_equation_examples_with_no_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f332e6f-de0e-41c0-8eab-a5f4d0956e06/xexitisobufejilufakukosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b9c814-212f-4741-8af4-511e90ad89ab/96288917020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a2b70e-03ae-4d5d-95ec-8d9d2e595bfa/48870073996.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_off0000d7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A5 5408 bytes
SHA-256: 9070ad34d8b5c3694bf64d4f547c1833dd3f947df9af53c889e4465acddd74f6
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 12336 bytes
SHA-256: 8601aa136988f7e9c355ef8d7e24b2775286852e483cdb7bd3d7622a50780e93