Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6e336381b0f544…

MALICIOUS

PDF

76.3 KB Created: 2021-04-25 14:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 78baaf9624c38e742dc0a7354989c2c5 SHA-1: 99404796cf971b3b075914d86b33b4eecb03a4b4 SHA-256: 8a6e336381b0f544584f1f8c3e5e99c866dc5cf151bc6d78c9021cdd04de7cf5
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://kuzutuzo.ru/strik?utm_term=canon+mp250+printer+error+p07 PDF link annotation
    • http://jatudoz.getenjoyment.net/puwunifabonena.pdfIn PDF document text
    • http://brosbass.com/tulaxipu2wxni.pdfIn PDF document text
    • http://dorugatutaxovi.scienceontheweb.net/deforestation_in_the_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/4b4ghii/92206363293.pdfIn PDF document text
    • http://evatopshop.xyz/regogoviris4qyig.pdfIn PDF document text
    • http://igcopyrightverify.com/tagedulibo3umk6.pdfIn PDF document text
    • https://cdn.sqhk.co/guzorata/idNKidp/wawuxelomokiwef.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/iSihjbG/gejemutalomutewal.pdfIn PDF document text
    • http://goldstein.capital/98957827053407nh.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/bomolirideselola5fhxv.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/49a3fe78-b469-48e3-b9d4-69f166ce56f3/glock_19_gen_5_leather_iwb_holster.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_b08dee1fac144b7a9a3a1cb9bd5a496d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8461097-b665-4e94-9eb7-6a521c3bc897/los_juegos_del_hambre_sinsajo_parte_3_reparto.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_0af4f1cf86004486b6519db875de52ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4213021-b131-4a7c-80b7-7453f8a83a46/oral_b_triumph_professional_toothbrush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9ee41d-0b9b-4411-801a-27da65446756/jojusujelajixopome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1f72c8-27fe-418c-b03d-fd4bff45ad5d/self_portrait_drawing_step_by_step.pdfIn PDF document text
    • https://2559d30b-64cd-4b4d-aaad-e76a675dde99.filesusr.com/ugd/f5a024_41b3852d83e94aa3b6d0f42d8f56f180.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_9af6b1a278204556a16c7262c597d266.pdf?index=trueIn 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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 5136 bytes
SHA-256: 4e5ad48aea89ccc402e746808ce6b0798ec2cee2f2b83382e27a7ab4644b6ff5
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10564 bytes
SHA-256: 19be34dada159c13f3c417f835f75d47a7723d7136285b676a9bc57b38454622

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