Malicious PDF — malware analysis report

Static analysis result for SHA-256 e272b3ca2f4c34d6…

MALICIOUS

PDF

69.8 KB Created: 2021-03-12 19:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 597ff33408f1048891449933b988921b SHA-1: 73bea92247ff8118e75b8ad513e9ced8b9672c18 SHA-256: e272b3ca2f4c34d65a20ac468415f7a6d55ac24d963bed022f8581635dd22401
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent URL being https://resalured.ru/aws?utm_term=vermeer+bc+1000+parts+diagram. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/aws?utm_term=vermeer+bc+1000+parts+diagram
    • http://ronefed.iblogger.org/gekikewawogato.pdf
    • https://cdn-cms.f-static.net/uploads/4467601/normal_601d638d5dfd8.pdf
    • https://cdn-cms.f-static.net/uploads/4421776/normal_5fe87300b1c3b.pdf
    • https://cdn-cms.f-static.net/uploads/4494661/normal_603417ff44002.pdf
    • http://xupubetulitut.iblogger.org/5_ejemplos_de_referencias_bibliograficas_en_formato_apa.pdf
    • https://cdn-cms.f-static.net/uploads/4490516/normal_600f9dc64cc6e.pdf
    • https://static.s123-cdn-static.com/uploads/4454990/normal_6007ef7fbffe5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://samugino.epizy.com/microsoft_word_download_fonts.pdf
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_988e40cbf8304dc78bb58c8afb6c432e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b787dcc7-63e5-47bd-afb4-a2ef9e9f83e2/viserus.pdf
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_a6d9a35928064afc96a7719af9cd1616.pdf?index=true
    • http://kezasifofajimo.rf.gd/symbolic_logic_calculator.pdf
    • https://uploads.strikinglycdn.com/files/b844f01e-b696-40e2-8932-68cc49de370c/zafujosuxobigugivofugef.pdf
    • https://uploads.strikinglycdn.com/files/7dcc3a26-1fc3-4ed5-b973-10aca2fa9f85/fifty_shades_freed_netflix_release_date_uk.pdf
    • https://uploads.strikinglycdn.com/files/7740da94-5074-4dfe-8c9d-f1082c2b4865/nordictrack_1750_vs_x11i.pdf
    • http://vadepik.epizy.com/bevusowi.pdf
    • https://uploads.strikinglycdn.com/files/f9741d51-9715-456b-9d1a-0b08bcc70d24/84456815067.pdf
    • https://9b321a86-0615-40a7-b684-6dced782f4cc.filesusr.com/ugd/e3cae3_1bd7314815fc4673a1e864b8ec7c8a3c.pdf?index=true
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_71cd7cdd563240d3a25705faf39d09e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3921b4f2-b204-4391-a3ff-63e65ea3fd02/93681198145.pdf
    • https://uploads.strikinglycdn.com/files/3bcbb248-120b-4eea-9515-ae79b54bb5ed/kewasufile.pdf
    • https://uploads.strikinglycdn.com/files/340d44cb-ed42-4616-ad3e-b4e93f6b4b9c/35410931757.pdf
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_bf9cc93c9b9d424d8a3662fcab17f71c.pdf?index=true
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_e4bb2c6e75454d12a1dcde327f70bdae.pdf?index=true
    • 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_off0000d40b.bin
36c5993b1f5c965c00bbd3dc1d5f9a1575642d53c8c8140a6d4e256f0ea77b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 5660 bytes
font_01_sfnt_off0000e737.bin
4eafe29dc7e9e97d42ec85481195b36790da2ea7e322627520644c53bd724043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 9936 bytes

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