Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cc80a3864aa538…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 14:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 45a9dd3c9f2698270dd1d72b2f75a21b SHA-1: 4db16eb10578c58189e958b0428198d643d61a90 SHA-256: 55cc80a3864aa53846995023b2389f3350186e1aeec5c1391fb7449fc9b22bb4
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=silver+linings+playbook+streaming PDF link annotation
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/65112749669.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61449799af599.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/46120134898.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bowutupenitodobapominije.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/30090649829.pdfIn PDF document text
    • https://lesura.net/userfiles/file/dobokelafepoxejipixemi.pdfIn PDF document text
    • https://ccs-corporation.com/ckfinder/userfiles/files/86400913921.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/xuxutemavatazodufe.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/23827987070.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/lasubumir.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/kekajetutasiwis.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/zuxadiwisojesuxudexete.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/18168652193.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/18580863239.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/wadasar.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/86668336559.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/75782681966.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/62958227799.pdfIn PDF document text
    • http://fluorescent-training.com/file/88664083119.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/11662798510.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109141900245243.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE6 17684 bytes
SHA-256: c679de410e57441ea3ded17a081f0c00c70b81251d2712ed261f3a5e5886620a
font_01_sfnt_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 11080 bytes
SHA-256: 63b50201406613f8c9e4950cb31362f96b91ec47c324220c4d965aa0bdcd7db7
font_02_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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