Malicious PDF — malware analysis report

Static analysis result for SHA-256 426aa94393118324…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 14:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bf8cb86034cc9c96f18cbdc708d68a5b SHA-1: 16784e986364cb9ad89519fe436af19c1dfd2713 SHA-256: 426aa94393118324a5783bcfaa1dde151a8ade5933083527192f9f83ca86d5d2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/wix?keyword=cisive+background+check+contact+number PDF link annotation
    • https://nudusomezuriful.weebly.com/uploads/1/3/5/3/135387444/jagesodujigo.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/87618551669.pdfIn PDF document text
    • https://nugukijozagesek.weebly.com/uploads/1/3/0/7/130739433/b17406bbe6ed44.pdfIn PDF document text
    • http://salimom.mygamesonline.org/nepesiref.pdfIn PDF document text
    • https://wufazovop.weebly.com/uploads/1/3/4/8/134884286/1321914.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/e2cf17.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/3105057.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/9709711614.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/29139429341.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_6ded87e8ad6d454aa91af6b87483c833.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/vinerufewapajuzodami.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_48368c5fc9404d58a38e4e5fa94dbbce.pdf?index=trueIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/canales_de_comercializacion_de_un_producto.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/ardhanareeswara_stotram_in_tamil.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_28443279c0054ce8a0349c7400b1c48e.pdf?index=trueIn 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_off0000eb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6B 5492 bytes
SHA-256: 65a2d940bd35b821ed9b6c0cbb9761482060f8226f1772ea359fed31fbb43f00
font_01_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 11012 bytes
SHA-256: 398e3921620b051ae5035310724acfdd559cd9356eca2d100a0da825a8130363

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