Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a9506737f02ec9…

MALICIOUS

PDF

82.3 KB Created: 2021-03-30 11:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cbd5af024485ca012139518418b3b859 SHA-1: 5936c14b0c2b96c08aeba84ae8bc8c8a858aef6d SHA-256: f0a9506737f02ec9b21a0913dce5e34188051965ef839f93d1a3fa3b7a3df982
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://gimoguvi.ru/strik?utm_term=how+do+i+fix+my+canon+printer+error PDF link annotation
    • http://it50disconto.info/waburuw64dh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446390/normal_6025c40a36da0.pdfIn PDF document text
    • https://fevupadijedip.weebly.com/uploads/1/3/1/4/131407665/jujupivupo.pdfIn PDF document text
    • http://nat-yoga.space/45648637529xpldl.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/a23db63a7dd7192.pdfIn PDF document text
    • http://kvrovk.xyz/the_magic_of_believing_wikipedia9m75q.pdfIn PDF document text
    • http://losinglotterynumbers.com/zineta9mww.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_6003c08d87c21.pdfIn PDF document text
    • http://mihetos.xyz/lodekusoxirejowewega7n.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/tanizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_8c447fbe64e74e199b169d851e7a3f57.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_600017fc74bf46c99656fba5ed07196a.pdf?index=trueIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_ebde71b100a146628bc6d22ee60923e9.pdf?index=trueIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_580c8f1605f04260b405437d2f9883db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c99300e-cfaa-40d3-88a0-fc575b8d34cd/71281661900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417e91a1-e2c1-442b-8e25-4fabdf2ce9c3/13730456494.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d44232498b3d4784aa5e41ff47e4ff45.pdf?index=trueIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_6ad5d635ba6048dba339dbd25e59d520.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_14feaf06feda4b6db61b6d9814aeaac8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6b0d78-c94c-4a03-bef5-19e63b960e96/what_can_i_do_with_amazon_fire_stick.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_a1702f9132ce492ca90f955773a22d41.pdf?index=trueIn PDF document text
    • https://ad217471-f301-4d07-b05b-71cdb813ff8b.filesusr.com/ugd/4f915f_60c3f71beb56407d841182c5a9ecc09f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 3384 bytes
SHA-256: 8b9d8740fa42582e1afb51367a9fe1a4a825a6eb719c1b4f6890f84f227bcfdd
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 5316 bytes
SHA-256: 7993fb98a6843734259c5f405b8b59d810bebb6bcc939c75aac4773f1d37e055
font_02_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 11188 bytes
SHA-256: 77e00966a60d9fc190203c0d0688c8fce5cc2bcbed90a89f88b70a3888418a18