Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a69f4fff24dd2b…

MALICIOUS

PDF

74.0 KB Created: 2021-04-23 23:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fd2881b22c9c69bea8e48e14c5b24ecd SHA-1: 562809b8e23fd3a25aa3caa9891bfa1d2d3b01d3 SHA-256: 64a69f4fff24dd2bb83442ec7c937211f285b051975b2498ecb5d107276d2f91
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to link farms and potentially malicious domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to distribute malware. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the link farm structure suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=what+is+the+bigger+leaner+stronger+workout PDF link annotation
    • https://piteselijofer.weebly.com/uploads/1/3/4/6/134608400/nomupe_silodulefev_wuvubafodu.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/e7f7b3abd2b984d.pdfIn PDF document text
    • https://noperutepa.weebly.com/uploads/1/3/4/7/134721309/kofopowipow_mugewa_kasodej_zepimelegelajo.pdfIn PDF document text
    • https://sofusetagiwubok.weebly.com/uploads/1/3/4/3/134320735/lovonixedelut_fudozisif_zavujafabofu_zozigama.pdfIn PDF document text
    • https://viwajojavejad.weebly.com/uploads/1/3/1/8/131858172/2237915.pdfIn PDF document text
    • http://xekupaseze.iblogger.org/kizakejisolosera.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/f885cd129c1f210.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/6536563.pdfIn PDF document text
    • http://fuxivipusutipu.iblogger.org/61375953153.pdfIn PDF document text
    • https://bokojisegozesu.weebly.com/uploads/1/3/4/4/134479890/jexifiwu.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/juzowilipi/gekowejivuditoputuviz.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/sinizufedorotik.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_c0b329bc315440b8937484acfbbc7ecc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/76409641750.pdfIn PDF document text
    • http://duzifamu.epizy.com/writing_algebraic_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/sigovimesowobigaxinigu.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/4445623642.pdfIn PDF document text
    • https://d2ffd92d-ad89-4e9b-8359-126286817a3c.filesusr.com/ugd/dd9784_0890f94d0fb7416d9387e94c897c48e4.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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 5256 bytes
SHA-256: e4cf409d586cf90626911d1b8d5b135f3e776a95262c313b1a5e02e75f647337
font_01_sfnt_off0000f671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF671 10656 bytes
SHA-256: 6d169b1c969acec7f70d405a888b423142c11cfce5cb0c82e6a0fbdfd598a4da

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