Malicious PDF — malware analysis report

Static analysis result for SHA-256 764ae2f396049956…

MALICIOUS

PDF

75.5 KB Created: 2021-01-13 17:16:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f75040f938cc08b66377dcf938be6d63 SHA-1: 9863ee9c142754c70016330c1542f5483bab2097 SHA-256: 764ae2f3960499567bbd577b3cf78f93ea27a066497d1bf33e0a67f5f9d06955
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://traffine.ru/123?utm_term=college+run+farms+facebook PDF link annotation
    • https://cdn.sqhk.co/fatidizeru/hbxjjjg/12480592983.pdfIn PDF document text
    • https://site-1172779.mozfiles.com/files/1172779/43635569394.pdfIn PDF document text
    • https://site-1177636.mozfiles.com/files/1177636/audi_q5_android_auto_wireless.pdfIn PDF document text
    • https://site-1180410.mozfiles.com/files/1180410/futedovi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5fc9122b3d396.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_5f9b00b8980dc.pdfIn PDF document text
    • https://site-1175908.mozfiles.com/files/1175908/metube.pdfIn PDF document text
    • https://site-1187532.mozfiles.com/files/1187532/ncert_science_book_class_9_notes_download.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/8hbTYgf/ligeruvafewusokefoluji.pdfIn PDF document text
    • https://site-1168272.mozfiles.com/files/1168272/retail_management_jobs_colorado_springs.pdfIn PDF document text
    • https://site-1178914.mozfiles.com/files/1178914/sexatazatemasaze.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/xupimaral/toro_tc3000_trimmer_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/58411383315.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/guvelorelot.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_off0000eac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC8 5308 bytes
SHA-256: 828256c84cf7cabdc093c1f5cd87a21f62a9a86b377fd015a8031e383cf22bfc
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10768 bytes
SHA-256: 94791eb1f377d7cfab7afcadb0507ef42873b517c92850d654f4e7e4a0b59886

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