Malicious PDF — malware analysis report

Static analysis result for SHA-256 b961b7345c65f0ef…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 04:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 78a8e7de973042a13a04d3a9d1eeb6e8 SHA-1: 894daf36d2267c30cf5e76956dbd1e34b21317dd SHA-256: b961b7345c65f0effd1fd7aa0de1b902af14b59809e8d45c9b7ceb2196fe6513
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a common phishing lure.

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://midufefew.ru/award?keyword=understanding+business+nickels+pdf+free+download PDF link annotation
    • http://interbankdigital.com/12379423595qqjkm.pdfIn PDF document text
    • http://fivadoguna.medianewsonline.com/89861743569.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/10291436523vkm18.pdfIn PDF document text
    • http://hardcreditcheck.info/criminal_justice_attorney_meaningp31f0.pdfIn PDF document text
    • http://naturalm.space/20315291209d4u73.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/41873890012.pdfIn PDF document text
    • http://kzrovk.xyz/343543671522u7i8.pdfIn PDF document text
    • http://bio-ita.fun/here_we_go_city_navigation_apko6x54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f4f5d57-912e-407f-b83c-ad0c734cbbd6/how_to_change_ink_cartridge_epson_xp_205.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/35657631388.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_3410433416a243299c765075e18b888b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/putomatoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab91cb07-547b-4851-8a6b-7a6feef06713/how_chipmunk_got_his_stripes_character_traits.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/appareillage_schneider_unica.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/3714080341.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_7ce6e46b38ce4edd95e5a983447d502e.pdf?index=trueIn PDF document text
    • http://vobikeretuwof.atwebpages.com/junoduvoga.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 5612 bytes
SHA-256: d9510e9bc75f4dc097d8d43428fc541660d991334bc29c9d083ee8e8d79f0f7d
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 10620 bytes
SHA-256: 07823dfa182b4c2668168fbcc49531e04a6c901ce007630a53170d34d08899e6

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