Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ac9f8187b14e30…

MALICIOUS

PDF

77.7 KB Created: 2020-12-25 18:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 39372a7dbc76f66d12a6ed83d6afaf4e SHA-1: b4c7cac5c18422d98d2fa91c39339a292fd6b7c8 SHA-256: 93ac9f8187b14e300e35fc9ab9df2b26ac047a910c64cea79c16beb3f9570ec6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, and an external URI points to 'trafffe.ru'. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature strongly suggest an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trafffe.ru/strik?utm_term=lineage+synonyms+family PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474988/normal_5fe595ef6a150.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/bNBggv9/nyan_cat_lost_in_space_apk_download.pdfIn PDF document text
    • https://nifadajenekipib.weebly.com/uploads/1/3/4/3/134305148/bixonajavarikabawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fbdc6d27dc23.pdfIn PDF document text
    • https://mafobosapufi.weebly.com/uploads/1/3/4/5/134505980/genefenereraki.pdfIn PDF document text
    • https://wapilumavazari.weebly.com/uploads/1/3/4/4/134446451/jimatekaduruxenola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_5f9262be65be2.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/ruzaganog/21288825296.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/jeriwasoluwarovuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0853cc59-deaa-468a-80b0-b1d782fee455/plate_tectonics_vocabulary_worksheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29A 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000dcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDD 5032 bytes
SHA-256: 4990acc94ab8b8fb4820c8ec05b62a3bdb4ba0b3cde76c7f463a97413469ec3c
font_02_sfnt_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 11496 bytes
SHA-256: 13662f25cfcca0b9c8fa4cf72fa566b4cadf2bad55735868cc0be7fc77628329
font_03_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 16132 bytes
SHA-256: 43e84046d57c5d8edad47de9228ce36feb53c5e515436c294a71041590f3a3a6

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