Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d98907d3b0e286c…

MALICIOUS

PDF

107.5 KB Created: 2021-05-28 07:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ccc2feb7f7da16952aa7c042ea29d06 SHA-1: 84f2724577ef3e9782308558e786552b4f0c05ad SHA-256: 5d98907d3b0e286c8ca165c9704729d78fedb5cee5a14802e24521f5fc900ab9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Weebly-hosted PDFs with generated slugs, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked pages. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wb?keyword=new%20world%20of%20darkness%20merits%20and%20flaws
    • https://mugunerer.weebly.com/uploads/1/3/4/4/134479547/gulowaxaban-dimir-waduwokiv-marorezonemika.pdf
    • https://rolemefusibo.weebly.com/uploads/1/3/0/8/130814279/gominurewijupikati.pdf
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/gikafu_sekuzadixoz_rufufinaduw.pdf
    • https://tilobumofiraji.weebly.com/uploads/1/3/4/4/134492377/ebe7487.pdf
    • https://wawomageton.weebly.com/uploads/1/3/4/5/134584849/1553666.pdf
    • https://poxesogu.weebly.com/uploads/1/3/4/8/134854809/lajotezon.pdf
    • https://sovurides.weebly.com/uploads/1/3/5/3/135349611/e2d415cf.pdf
    • https://rijivujebevobog.weebly.com/uploads/1/3/4/4/134488471/fumaz_pifolivekiwuw.pdf
    • https://kubazabuz.weebly.com/uploads/1/3/4/8/134885093/717e107d8.pdf
    • https://futibiwis.weebly.com/uploads/1/3/1/4/131408183/pugulewike_xuzowo.pdf
    • https://vurineju.weebly.com/uploads/1/3/2/7/132741272/c9b5daf3759f4.pdf
    • https://firuruxuzero.weebly.com/uploads/1/3/7/5/137502241/puxifofudodufig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/49353909-7b22-40a9-9faf-2d16500a9064/71247102760.pdf
    • https://uploads.strikinglycdn.com/files/fdcec9b3-1a29-4e1d-8ba6-39ebf70518f7/whirlpool_fridge_ice_maker_parts.pdf
    • https://uploads.strikinglycdn.com/files/2f19dcd5-de9f-4f62-a975-2a5f6621a4c4/zagomilekemozuvakex.pdf
    • https://uploads.strikinglycdn.com/files/1d221b49-e76a-4850-8b78-30d63172e465/jefagebidu.pdf
    • https://uploads.strikinglycdn.com/files/27874dee-6b8c-438d-81a8-426fe65b8ddd/crock_pot_express_manual_pressure.pdf
    • https://uploads.strikinglycdn.com/files/8ce4e6f2-db6f-4be7-9cb6-0ec30d754141/nufomipidotoxusapefigi.pdf
    • https://uploads.strikinglycdn.com/files/2f9e32bd-e190-4b14-a0df-17897cfc531f/75823035786.pdf
    • https://uploads.strikinglycdn.com/files/f7d50067-47ec-46d0-9674-8b69af347f09/galifesamafufizota.pdf
    • https://uploads.strikinglycdn.com/files/603bcff4-d517-4e8f-ae61-d02479f5d5e4/venozobirasaxobonogomifar.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_off00016a4e.bin
91c86ed937aa87f6ae4ffcace5307c71b47abc203df4be96fc4f712449f8f458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4E 5176 bytes
font_01_sfnt_off00017bee.bin
e72ee2e073d2d3647a6d9292932abd4616a0c51003e761616757cca83f856a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BEE 10476 bytes

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