Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb973ee907d6f79…

MALICIOUS

PDF

74.3 KB Created: 2021-01-10 17:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 21c0768ca6c475df6209e90e416ea8bc SHA-1: e25f8535b916456dfb05a0eba84389c0df613bfc SHA-256: cfb973ee907d6f79cdb54959760e46d0f2db871e58d622a122f751d899d676bf
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'trafffe.ru' and associated with a 'banking calculator' lure. Heuristics indicate the PDF is a link farm on disposable hosting, and ML classifiers and ClamAV strongly flag it as malicious, specifically as phishing malware. No scripts were extracted, but the overall structure and URL suggest a phishing attack.

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://trafffe.ru/123?utm_term=renatus+velocity+banking+calculator PDF link annotation
    • https://site-1179658.mozfiles.com/files/1179658/vafitemitimapagidow.pdfIn PDF document text
    • https://site-1171105.mozfiles.com/files/1171105/virtual_doctor_hospital_er_emergency_game.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/golden_bubble_sort_expert_level_63.pdfIn PDF document text
    • https://site-1198047.mozfiles.com/files/1198047/sevefidexupapulolibuluno.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496811/normal_5ff09280e2604.pdfIn PDF document text
    • https://site-1175261.mozfiles.com/files/1175261/dynamixel_xm430_emanuel.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/ebhcEEP/80257081253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_5ff082eb9ada2.pdfIn PDF document text
    • https://cdn.sqhk.co/vixonafom/hticidx/72964452657.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_5f9215ca116d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f8f8a3f2ce89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5f88cf9f5a6a3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/jorebifo.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/46400817814.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/dasovimabaxuxutuketokob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 5220 bytes
SHA-256: c5a26a0b11e54bebf98200e4117ac76edac4a5a18fc939decc67cd6e08ea9c18
font_01_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 9836 bytes
SHA-256: d5a07955ead0d4b8f57493152ca9c29a58b4e666cf6205d5d7fee014db23732f
font_02_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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