Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89782719766c110…

MALICIOUS

PDF

76.1 KB Created: 2021-03-03 19:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8263e69e2b46aa1c9f3b8f99930c72e6 SHA-1: f578e498ed57e5ac10ef86a1f73e30f62eec16a7 SHA-256: f89782719766c110e2f3fa3ecc45fce79f078bd439a866aaacc6eff45048782e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting services, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to thermostat repair, designed to trick users into visiting malicious sites. The presence of external URIs and the link farm heuristic indicate a strong intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/123?utm_term=how+to+change+the+battery+in+white+rodgers+thermostat PDF link annotation
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/4627016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_600dc4ae11ce9.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/jhf9DkH/lavuli.pdfIn PDF document text
    • http://vuzetasavuxoso.mygamesonline.org/how_to_write_a_compare_and_contrast_essay_mla_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365646/normal_5ff1b3d870d37.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/jxOjftH/61353818716.pdfIn PDF document text
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/2042157.pdfIn PDF document text
    • https://cdn.sqhk.co/mowezeto/jfQDig1/original_fallout_shelter_sign_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460678/normal_60067d933731d.pdfIn PDF document text
    • http://balegetiwep.mywebcommunity.org/779227474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_602127058c9b4.pdfIn PDF document text
    • https://goxapixexaze.weebly.com/uploads/1/3/1/6/131607486/ffd768d7a5a8d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419857/normal_5ff344e023e22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowofiz.myartsonline.com/wubekinutezajufiponofat.pdfIn PDF document text
    • http://pezamax.myartsonline.com/signs_a_guy_isnt_interested_in_you_anymore.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/denon_avr_1712_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/xirusepiwofisel.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/kirolovuzijarap.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_off0000eb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 5616 bytes
SHA-256: ccb1a44b7b6876bf195a50c752c82b332b3bc6fb795b452db27e0295f7ac22d5
font_01_sfnt_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 10676 bytes
SHA-256: 4d6797f9cb4ab2dcd2d7b067bc15411376637c5e7914bc3c4c5d0e4136cdb213

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