Malicious PDF — malware analysis report

Static analysis result for SHA-256 984a8e751c38596c…

MALICIOUS

PDF

80.9 KB Created: 2021-05-28 22:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0411d43a8b21952ab48aabc7437660c8 SHA-1: 400f070b201c907bcdba9431e0b4e944a87afe40 SHA-256: 984a8e751c38596cde0ad43a63c55cf65495552ebc22d5491e69a7aa25f6efb6
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, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URL observed is 'https://seumenha.ru/strik?utm_term=divinity+original+sin+2+character+creation+reddit'. While no scripts were extracted, the structure and numerous external links strongly suggest a malicious intent, likely related to phishing or SEO spam, and is classified as malicious by ClamAV and an ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=divinity+original+sin+2+character+creation+reddit
    • https://cdn-cms.f-static.net/uploads/4382627/normal_60172c56c5230.pdf
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fcd42a3cd1f6.pdf
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fcafa0b3c052.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5fd88e1920c4f.pdf
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/9480406.pdf
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/bibaje_nawizuwi.pdf
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/7296320.pdf
    • https://zixatemanareku.weebly.com/uploads/1/3/4/4/134472678/8302029.pdf
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/1bc3e6b9d35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81dca14d-189f-4da6-a45a-8f1144179351/what_do_you_need_for_private_investigator_license.pdf
    • https://uploads.strikinglycdn.com/files/1430e2b6-34e4-401b-aad1-da915327f884/an_introduction_to_language_9th_edition_download.pdf
    • https://uploads.strikinglycdn.com/files/a1c46aa5-ccdb-4222-bfa1-a0b1ac9657ba/freightliner_stereo_wiring.pdf
    • https://uploads.strikinglycdn.com/files/14a43b40-8d5d-40a6-bd2e-bac6dee051a9/57063785701.pdf
    • https://uploads.strikinglycdn.com/files/598e50c2-05e9-4f59-b34e-377a7db50ff6/81017671934.pdf
    • https://uploads.strikinglycdn.com/files/a8107037-20a2-4b61-913b-75d9264497f2/mizazidakukiwesewixus.pdf
    • https://uploads.strikinglycdn.com/files/48d62735-4157-4869-8f46-60d1ba6ac086/18428874601.pdf
    • https://uploads.strikinglycdn.com/files/c9660981-f691-4003-a702-196a1c30f267/nusuzonizufixaxosulot.pdf
    • https://uploads.strikinglycdn.com/files/d6f227c2-bf91-4a7d-b634-42eace5ebdf1/dd_phb_spells.pdf
    • https://uploads.strikinglycdn.com/files/864e8607-42e1-44df-b1f5-9c230c65b72c/what_is_the_ratio_6_to_9_in_simplest_form.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_off0000fec4.bin
194664ac3c05faa07a2cf10d4aa0b63ec408225896ecb48285b77acc66f92f21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 5492 bytes
font_01_sfnt_off00011182.bin
a346b96bed4df73a053ed21033b26978f46282d42a602b6a41b1f9b63d68e8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 10768 bytes

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