Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff18c4c54929ded…

MALICIOUS

PDF

101.2 KB Created: 2021-05-03 07:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1352bfa1080afcb49d29ab9bc37409c5 SHA-1: ce7a6c5940b7a529fb66b9e4030bbf05dcea09cd SHA-256: cff18c4c54929ded90c684e3120120abdb53916b77eb86457d9c3fc814ec5076
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://jacksth.ru/strik?utm_term=albert+pike+letter+wiki PDF link annotation
    • https://fenotitejov.weebly.com/uploads/1/3/5/3/135316040/9766443.pdfIn PDF document text
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/a9d9fe981.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/3058e9487afa6.pdfIn PDF document text
    • https://ratilobavet.weebly.com/uploads/1/3/1/8/131858747/xosapuwa.pdfIn PDF document text
    • https://dasirexifavud.weebly.com/uploads/1/3/5/3/135320576/e450b6.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/2f0a3d88.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/7603bdd0.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/bb151ce.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/716b97.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/391384.pdfIn PDF document text
    • http://reactivascotia2020.com/49465393225i7ruw.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/8645919.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/mumudedom-tojejeliwuku.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/jonobenikexoxebavum.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/9134922.pdfIn PDF document text
    • http://wovugikanagak.scienceontheweb.net/business_card_format.pdfIn PDF document text
    • http://mebelrostov.ru/aguas_de_marco_pianobxmzl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rususekobijo.myartsonline.com/xovojogurodofije.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A41 4284 bytes
SHA-256: a2dd175dda422fc964fadc087bc7c75a89c7df4670cf1a0ddb5cd5715d4f072b
font_01_sfnt_off000138dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138DC 12864 bytes
SHA-256: b25b20c84843605f0370393c797e9d9b17a6b6040cbcf4412cc21e49c0f7bd84
font_02_sfnt_off00016261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16261 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off0001778e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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