Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153d83926f3d879…

MALICIOUS

PDF

79.4 KB Created: 2021-05-27 14:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d8b683649af60dbf746e9db55189412 SHA-1: df83971f45d8ed01bf03f6e68249a679bfd2d635 SHA-256: a153d83926f3d8794cbb2e9be38da05e0b4fd07c6e39eb6f95c8a12c7f985041
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=wrist+fracture+rehab+protocol PDF link annotation
    • https://xaranetudu.weebly.com/uploads/1/3/4/0/134016810/3353024.pdfIn PDF document text
    • https://vudunige.weebly.com/uploads/1/3/5/9/135981242/gadezijo.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/6208190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5fd24f41e1621.pdfIn PDF document text
    • https://jejedutetobi.weebly.com/uploads/1/3/4/6/134662716/5c4156ff.pdfIn PDF document text
    • https://nasejanebuxilas.weebly.com/uploads/1/3/1/8/131856105/nokojosiwiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_603866adf246d.pdfIn PDF document text
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/sidamugiwodekomugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_600b0dcd47ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_603891796efc5.pdfIn PDF document text
    • https://bizupuligal.weebly.com/uploads/1/3/4/6/134603830/fezuxeja.pdfIn PDF document text
    • https://kuxobemif.weebly.com/uploads/1/3/1/3/131379353/3788847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_603bed5cdf518.pdfIn PDF document text
    • https://jotuxopa.weebly.com/uploads/1/3/4/2/134265841/4735513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391335/normal_5ffca2c43c940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473645/normal_5ff93e09d2d4e.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/62acc152-4ab8-4b72-9b64-d4dc07f42c09/dyson_ball_animal_2_upright_vacuum_refurbished.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c808003-b149-44d0-9b89-40e7efd16197/ways_to_store_ipads_in_the_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/941fc2e3-4eaf-4556-a04f-3e8d7a15e5f7/xomekinitisiripij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82961d47-1627-4efc-9d08-d39edc5721fc/42199684956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5743adf8-3ec0-4f19-b307-a84ceef897a7/53104886793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13b80f14-cbff-47b3-8d55-250147ee9be7/56326929418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6835e754-aa78-4f37-bcca-6a7dbccf55a9/69930467623.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_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 5256 bytes
SHA-256: 28e5869de727c26d589cffa10846f950511d3beeb5c57f5eafcbbe210fa9e1e7
font_01_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 11104 bytes
SHA-256: d27cb92b6dc6e0a26810c71482832550af07c568aeb6085ce1f588aee7927ac5

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