Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2f3be5fa38c416…

MALICIOUS

PDF

76.5 KB Created: 2021-02-05 15:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ca0b91ccfbc0f35253de607c2350d3a4 SHA-1: acb4be0eb16e6b66ae908c0135b86a77d7529f6e SHA-256: 9f2f3be5fa38c4167f6101edd851b237a540600b1ae3dbd5bbf5d043d8561308
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=the+land+of+stories+beyond+the+kingdoms+pdf+download In PDF document text
    • https://wirimodarezekas.weebly.com/uploads/1/3/5/3/135314182/lomixenu.pdfIn PDF document text
    • http://varistop.site/easy_diy_pallet_projects_for_beginners6jaqo.pdfIn PDF document text
    • http://lestyprin.online/89798708982nfc0x.pdfIn PDF document text
    • http://iclod.tech/acordes_de_guitarra_canciones_romant8tehb.pdfIn PDF document text
    • http://homiak.fun/79291625360ms1rj.pdfIn PDF document text
    • http://bifitiguz.iblogger.org/17217980609.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/2411795.pdfIn PDF document text
    • http://podarokinsta365.site/mobile_data_keeps_turning_itself_offjxqf8.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/ZyjafBt/unicorn_photo_editor_apk_download.pdfIn PDF document text
    • http://rimka.xyz/signals_and_systems_roberts_2nd_editvgjba.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/hs8SLp8/bream_fishing_tips.pdfIn PDF document text
    • http://blu-ital.space/246057195183xm5n.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/vumerofezi.pdfIn PDF document text
    • https://litufefanim.weebly.com/uploads/1/3/4/9/134901191/magiwalizatuz-zobasoj-guwedibik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusewijoje.epizy.com/jumble_chicago_tribune_answers.pdfIn PDF document text
    • http://filivuso.rf.gd/chopin_ballade_g_minor.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_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 5804 bytes
SHA-256: b86db4c2ff8d558c8e2a8908774396849570f7d071cf080041e4689a066f1c6d
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 10892 bytes
SHA-256: 65dd043f2b28d2bc69fc07029303ce539390a093d801fcd090bf8e5611648753

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