Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4d7884b4f2074a…

MALICIOUS

PDF

75.4 KB Created: 2021-04-20 07:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 74642d41030a4516e65a72667d62fc0c SHA-1: 43b0ae4dded639f6c14dd69d6496406cb9fc2758 SHA-256: cc4d7884b4f2074a1ab8d79faa888f445c4fa1ff4e7730dba5a3f7a9bf5224fc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://kuzutuzo.ru/strik?utm_term=what+battery+does+the+hp+12c+use', likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to malicious content.

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://kuzutuzo.ru/strik?utm_term=what+battery+does+the+hp+12c+use PDF link annotation
    • http://francobusiness.com/bubble_gum_simulator_codes_wikik8swn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_604d180f752da.pdfIn PDF document text
    • http://mon-cmbretagne.com/womebojawsn7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_60502ab277490.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/rufusalapadepudo38lsp.pdfIn PDF document text
    • http://specrazreshenie.com/452296924956nat7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_6065d106c403e.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/jgz3Hji/46752387396.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/8jiotih/wovexaz.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/ff9ad0be-1b08-4f01-b1cc-57edc170d655/zakawetudifadafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3acdf3-5a2b-4fb5-abc8-a51bcfc93e8d/47099784314.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/aventail_connect_tunnel.pdfIn PDF document text
    • http://pijularof.epizy.com/glossary_of_computer_science_terms.pdfIn PDF document text
    • http://zinuforonubas.rf.gd/lodivinatuwijopod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862a9eaa-943a-4609-b8e1-6a9186f9857b/matlab_simulation_tutorial_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/63879817059.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/lexilufu.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/fanuc_arc_mate_100id_manual.pdfIn PDF document text
    • http://xapakiz.rf.gd/3879328842.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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 5568 bytes
SHA-256: 37c8fe02f9ed2c1aa2a8b8576c06dd584a8a38de9f10a6a4189332ae005081ae
font_01_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 10656 bytes
SHA-256: a55ec6130d61941365f1859a8d2c715f8491bd3c5f63e03c1a7462d3e32b3d54

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