Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cb5ce31a77e46b…

MALICIOUS

PDF

77.3 KB Created: 2021-04-08 00:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7746a53a06c006b7ee0d4c3f824f5942 SHA-1: b445ed5cd8ba5816018792f72f49116ca6494e65 SHA-256: 64cb5ce31a77e46b7bdd02782585c52d4d40c0dc7d225c7ce92b39bad01af9f9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+do+u+count+atoms+in+a+chemical+formula
    • https://cdn-cms.f-static.net/uploads/4380382/normal_603681384426e.pdf
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5fd9fed31d3c4.pdf
    • https://cdn-cms.f-static.net/uploads/4491723/normal_601bd1aeae342.pdf
    • https://cdn-cms.f-static.net/uploads/4407069/normal_605bbc39dd14c.pdf
    • http://medway24.com/79924393243ok8az.pdf
    • http://cabinetshq.xyz/sojejavazakuzizixinesee8ztc.pdf
    • http://euroshopmn.space/what_kind_of_intermolecular_forces_are_present_in_so2ia27p.pdf
    • http://dewobazul.22web.org/auxin_biosynthesis_and_storage_forms.pdf
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fcd0ab78fb95.pdf
    • https://cdn-cms.f-static.net/uploads/4450259/normal_6050fe9259d31.pdf
    • http://how2clever.com/can_you_buy_and_trade_stocks_on_the_weekend3lxz7.pdf
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd99206adc28.pdf
    • http://mybiol.site/heywood_internal_combustion_engine_fundamentals_second_editionv80zt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5fc527a9-5f99-4e5b-a301-5d926bc9d508/replacement_remote_for_sony_dvp-sr510h.pdf
    • http://gatapin.rf.gd/informationen_ber_das_brandenburger_tor_in_berlin.pdf
    • https://uploads.strikinglycdn.com/files/542b1dd4-8ab6-486e-81f0-e3cd69f84c36/jorubudilitakojin.pdf
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_03b3ad6b2bda4431858df031f61d095a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/09379af8-67ba-4c87-a55d-53a51f8c2c6a/pafaxuxomexikudabi.pdf
    • http://dibojun.epizy.com/ancient_rome_architecture.pdf
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_62f4a8c8f4264d11b846c22223322f3f.pdf?index=true
    • http://rafidomemekovig.rf.gd/74196409906.pdf
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_ad55031cc0e24a94a9cbd474a9388ea2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e12dd26-629e-43ae-943b-d55e3135d1da/zokewiwezidopevituzumu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec5.bin
796329920dc6ad9b0501c5823dbcc8558268b546957a1b611580977d4bfa9b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5316 bytes
font_01_sfnt_off000100bb.bin
02a17792b15ca959e36ca9b28d61a8cbd7428e8e208ba3e3af599f0180a79474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BB 11460 bytes

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