Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c986307faa850d…

MALICIOUS

PDF

70.3 KB Created: 2020-11-28 02:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a9652db3682b6a904b8742b4778df441 SHA-1: db77e8849cf6cb6eb46b06100b71a944ff025f07 SHA-256: 94c986307faa850d1894a5dfbfd214e80547d9e51fe7b978efea3defe3cee4af
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a callback phishing lure, prompting users to call a number in a billing or security context. It also includes external URIs, one of which is associated with a link farm, suggesting a potential attempt to drive traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffset.ru/123?utm_term=suntrust+auto+loan+payoff+address PDF link annotation
    • https://tijisuxijofijo.weebly.com/uploads/1/3/4/3/134374136/joboguropubu-gujugetato-sexosowokipizo-bivewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384030/normal_5f908d4ee5fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501514/normal_5fad92b6411d7.pdfIn PDF document text
    • https://piwuwati.weebly.com/uploads/1/3/4/4/134404243/8159032.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/4e73681b-a138-4652-b8ae-c0a70d946f1c/49944221125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4937e19a-774c-4f02-b722-467474c27804/dudupizejozasifufele.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/9976416052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0589d4c7-1b3e-4eda-9a8b-9bae8b7d6c9d/45575077406.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/equivalent_exchange_2_forge.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/lubopixinaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6195129-937d-45fd-8f4d-b0df700538a6/present_simple_form_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/android_asset_studio_icon_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/039c0a83-a4d2-46c3-b0fb-c9dc800e4a0d/audioease_speakerphone_torrent.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/mugoladepulimo.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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 5240 bytes
SHA-256: 13ac6c178011ee04df3a992b83e278e84e6cdc7e0948b5078c9b4942a426b5b6
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 10824 bytes
SHA-256: 9b5aee46ac8c0ace262d141f90c8ee4492298ae68f4358f9622da570c282e824

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