Malicious PDF — malware analysis report

Static analysis result for SHA-256 1712fc36eaa043b3…

MALICIOUS

PDF

66.7 KB Created: 2020-12-22 02:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b11b96970f2a5353c11ed4f5c19f9280 SHA-1: 09f13e3ae8160c835c7679c11306fa34fe7c3de9 SHA-256: 1712fc36eaa043b39a9cad6b52647512867dc0464ebe1cc6b84fcd35aef4e98e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/strik?utm_term=republique+game+story PDF link annotation
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/5122942.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/jovotipopudoxa.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/002f7106-1781-46b1-b99e-d76f57552c3a/2052643804.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/visuwufebufepolanixegutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c9204b-95e5-4fe9-88f6-a0bd81528cf9/spanish_pronouns_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/potevip/square_numbers_list.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/2015_vw_jetta_tdi_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6fe2a8d-904f-41f2-b650-691e03aa0591/sylvania_j2v48_heater_element.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/ielts_upgrade_8_listening_test_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tipakalif/newburg_middle_school_jcps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78bf1c58-f330-45b7-858c-1897d63670ea/qod_abbreviation_medical_term.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc597a0f9866f3fd2f3d113/t/5fd0648ba9460057587d2042/1607492747598/super_hero_knife_battle_free_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/renuwutavowego.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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 5516 bytes
SHA-256: a21790cd0dc702269cd015e13a0ffd26486b5047b91901bd8a792b70306a8db9
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 10168 bytes
SHA-256: ca525bce1bc6bfce59090378feac62a1df52dc937e4ae5835127a166ec5bf5b5

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