Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b5a2b46364191a…

MALICIOUS

PDF

83.4 KB Created: 2021-03-16 05:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c06d74d7cea52158be77a8046fb1f05 SHA-1: 7d1f9d3d78605d9ad872d90668e09cda39a593aa SHA-256: f6b5a2b46364191a68c7eb7bae4c61a04823fb789d39e81878c13fec4a488385
156 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are to benign-looking PDF files, but one key URL, https://ponafet.ru/strik?utm_term=how+can+nmap+be+used+by+threat+actors, is flagged as unknown. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=how+can+nmap+be+used+by+threat+actors
    • http://nomenowunesazoz.scienceontheweb.net/is_there_a_sequel_to_the_shining_book.pdf
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fed124a791b7.pdf
    • http://kaxiwemusemoj.mypressonline.com/2016_subaru_impreza_user_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4427274/normal_60417f2f2dae6.pdf
    • https://static.s123-cdn-static.com/uploads/4422659/normal_5ffcd1d14920c.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_601fd9d7a68a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lebaxa/7097607540.pdf
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_ad3e3953ac5f4deeb206a01a401bcffa.pdf?index=true
    • https://s3.amazonaws.com/divelatoxa/lenovo_t430s_wireless_drivers.pdf
    • http://zitadufafasid.onlinewebshop.net/verbal_reasoning_sample_test.pdf
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_1e519203d057426fbf3ec6a825589564.pdf?index=true
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_540a8454e0f84ce3b9575b6ad698fd84.pdf?index=true
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_4ae60e4e00ab43779e03d2a34ac754a7.pdf?index=true
    • https://s3.amazonaws.com/gofiguj/dell_latitude_e6420_service_tag_location.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_37a1c977087643e6a9cdadb614d86cab.pdf?index=true
    • https://s3.amazonaws.com/dowadotiju/tijiluwokawowegeripimapu.pdf
    • https://s3.amazonaws.com/bejokazemur/71728792051.pdf
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_c353e494b28a43348571d89307d20f31.pdf?index=true
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_deeabfd2b98f431fa51c9bc077e0ca2d.pdf?index=true
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_6875a3862d714e1ca2bfbf0bad36ff11.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_off0001076e.bin
2913407387e2c4ef299211ad18b0cbca103bb85b8dc9b7b082ec18cf0cab2ccf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 5576 bytes
font_01_sfnt_off00011a46.bin
93920effc0a9de647a05a32f05fd470a965a84d535b403952bb944dc9bbf51b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 10988 bytes

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