Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf009b10ceb4c669…

MALICIOUS

PDF

84.1 KB Created: 2021-03-02 06:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1bf60836121dc4b5c8e1797669f2b4f0 SHA-1: 865e4559da9a3481bfd86f864e5bb2c30015de96 SHA-256: bf009b10ceb4c66980eece2d708ae5e9c374d37ccacd75a3a77ef7feba713eed
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and a link farm heuristic indicates an attempt to redirect users to potentially malicious 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://jumiwimov.ru/aws?utm_term=what+is+the+meaning+of+a+mechanical+pencil PDF link annotation
    • http://goods-amzon.com/expository_essay_example_middle_schoolo25wq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_6034c947f2ebc.pdfIn PDF document text
    • http://filmera.ru/vehicle_maintenance_log_template_wordcm6l5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fd632c11f879.pdfIn PDF document text
    • http://xekizarobofoza.22web.org/1847243007.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/lurudexaxupavinivavuf.pdfIn PDF document text
    • http://nuverlites.online/6915198513e4tt9.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/sowizurikagosesuziro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63d105e272.pdfIn PDF document text
    • http://tetiviguxawik.getenjoyment.net/dinosaur_yoga_cards_free_printables.pdfIn PDF document text
    • http://zobebukore.22web.org/bfgminer_5._3._0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_602e5ec31e42b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zavivemigowoson.epizy.com/55799129421.pdfIn PDF document text
    • http://gabigirinekib.rf.gd/tupup.pdfIn PDF document text
    • http://fojagezo.rf.gd/best_synonym_formal.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/bosinupiwikutufem.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/hp_laserjet_4_plus_driver_windows_7_64_bit.pdfIn PDF document text
    • http://zilaxeputeso.epizy.com/5714826606.pdfIn PDF document text
    • http://muxolisakij.epizy.com/74265629319.pdfIn PDF document text
    • http://wufaxetotubiji.rf.gd/13616307525.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 3076 bytes
SHA-256: 934f48ab863f371e6e98e46f66f6532517a4e0bc15e5317fcb544cd5379b8c28
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 5344 bytes
SHA-256: 0ecb7d5d9a0782afb230073e5003817469468bc2671b8cdd82e43e88bec39986
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 11340 bytes
SHA-256: 1df9e2da20f6a9ad5a863219afc7567435a2e91917b5764b87398145334c54ad

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