Malicious PDF — malware analysis report

Static analysis result for SHA-256 886f9c7a960b273b…

MALICIOUS

PDF

67.4 KB Created: 2021-02-26 20:54:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 24e77a16e886354477851d145ca1f0f9 SHA-1: dadcb2810bcc9428bd4b093f3e84ae2b467ce59b SHA-256: 886f9c7a960b273bdbafbc9f2aa4dc9acb49f72eb76a5c2a8c7c7f1191a3dcc5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary external URI pointing to 'jumiwimov.ru'. Heuristics indicate it functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=the+hollow+bunbury+menu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473642/normal_6019ccb988a73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455403/normal_6006a785984ce.pdfIn PDF document text
    • http://ashotik.space/zasefitumugifojatexezkfhw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444657/normal_5ffc9df42d799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_601421ef966b8.pdfIn PDF document text
    • http://wigojomet.22web.org/where_can_i_drop_off_my_clothes.pdfIn PDF document text
    • https://zoradelageruwol.weebly.com/uploads/1/3/4/5/134591251/7f82ca0c0.pdfIn PDF document text
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/8282716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_5fd1747856700.pdfIn PDF document text
    • https://losarofimet.weebly.com/uploads/1/3/1/3/131384333/duwas.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/tifunapuwovalom.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/perevutorenunudokode.pdfIn PDF document text
    • https://vejupurujiku.weebly.com/uploads/1/3/1/6/131606174/jafigisalojujuk-tenazuxatad-powozusa.pdfIn PDF document text
    • https://tujulita.weebly.com/uploads/1/3/4/6/134687611/5354.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/ganubatebedoxez/bepugifebuxogux.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/zosilufagozud.pdfIn PDF document text
    • http://nevurewajarip.epizy.com/57419524291.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/rifavekowa.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_off0000cc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 4820 bytes
SHA-256: 56b7e02fa74f8dcc99149653638ef83a2a74641ebc19dbd7b74bd51fcff70ba6
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 10460 bytes
SHA-256: d23123c6368636a16f54284a18682bf7acca0ff852f07b55a4a05ba48a6408e9

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