Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39792fab5582405…

MALICIOUS

PDF

86.0 KB Created: 2021-04-11 02:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1bd6ca958ca911b7325da687c9901f81 SHA-1: 48a76d293bf62011f9f148bdc852f86f3ae58392 SHA-256: c39792fab5582405c209453695bf2a12d1b767fbb2799f3ffb944d892c08a1d0
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or redirection attempt. The document body, though partially garbled, suggests a lure related to medical symptoms. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

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://vilenefex.ru/strik?utm_term=cu%25C3%25A1les+son+los+s%25C3%25ADntomas+de+la+neuralgia+del+trig%25C3%25A9mino PDF link annotation
    • http://salonlabs.xyz/vomixekuvowijuxuwijyy27.pdfIn PDF document text
    • http://dewafev.22web.org/90701527230.pdfIn PDF document text
    • http://wedurorokim.mypressonline.com/51953631313.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/astronomy_today_6th_edition.pdfIn PDF document text
    • http://nout-prokat.website/28391282260g91hb.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/63beeb.pdfIn PDF document text
    • http://itali-big.space/litonip17jaj.pdfIn PDF document text
    • http://crawlmqyu.space/audio_recorder_android_library7yj1f.pdfIn PDF document text
    • http://oneitshop.info/adding_and_subtracting_fractions_with_different_denominators_examples5taom.pdfIn PDF document text
    • http://luzupogakij.sportsontheweb.net/kufaporusapejalawodawowem.pdfIn PDF document text
    • http://rolivazugatar.scienceontheweb.net/beethoven_in_havana_sheet_music.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/63926636882.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitujiduruv.myartsonline.com/72060228449.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc64d49d-adca-49d0-917e-8ebaa4d08347/31910658838.pdfIn PDF document text
    • http://zisoramemib.rf.gd/23243636240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e149e016-9d16-42a5-90e4-984cc239b9c7/math_expressions_grade_3_student_activity_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c727afd-6132-4958-8ed0-758cb698a6a7/how_to_install_pool_motor_shaft_seal.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/toro_super_blower_vac_directions.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_off00010e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E55 5480 bytes
SHA-256: 76f0dfd928b94e3df5a0b0e6fae612be08c522d92f24e97c7ea115d8f876f613
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 12204 bytes
SHA-256: 5f60ff660de6e3f3891c6b27fb5d910e40dbf94aeafa98de4c18fc662073e3fc

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