Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de17aa8c757803c…

MALICIOUS

PDF

77.6 KB Created: 2021-03-03 23:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dca640df9fa6c9a8106b263c01d362b1 SHA-1: 702dda5b7bab3f1563a3134b94c603f739625bfc SHA-256: 8de17aa8c757803cacdf18126e4db409c03eb770847fb92d8927cbe749150189
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL, 'https://kuzutuzo.ru/123?utm_term=goldline+controls+aqua+logic+automation+and+chlorination', is highlighted by heuristics as a potential link farm. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=goldline+controls+aqua+logic+automation+and+chlorination PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455642/normal_5fd7482ca7315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_60125e264ab5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_600eff34c2a60.pdfIn PDF document text
    • http://br1.red/diwixepuz9709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_60210f314955c.pdfIn PDF document text
    • http://didazema.mypressonline.com/how_to_fix_dryer_wont_start.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476273/normal_5ff65375f3c5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_60313e9ab2b84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_5febddf0e3bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_601f64dab23d8.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/uhbhgjx/tesiloxejukotol.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/1000_places_to_see_before_you_die_list.pdfIn PDF document text
    • http://fruct.space/does_3_day_potty_training_workksqh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5ff0336c21e70.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/85112471936.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/nofax91nu2.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/ibMja5V/fan_the_game_mod_apk_offline.pdfIn PDF document text
    • http://good-production16.site/mopeguvoxulebqew40.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/legedazikomad.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/76874003661.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/chocolate_film_all_song.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_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 5512 bytes
SHA-256: 68d15980c6850d7cbe86fe1a2cda9f1cecaf415477d2a9d55c92cebebc3ef379
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 11372 bytes
SHA-256: 96ff69e6341bfd56696bc25ea47da1fdfae8c4714e3d600d9b1509039f9002c8

Open this report in the interactive analyzer, or submit your own file for analysis.