Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b63bef52e416493…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 06:46:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5cce1cf5da4e9a7741d4757b8e3dc0f SHA-1: 75c90ed9f44c066570ec714aa2c0a0d8e797b05b SHA-256: 1b63bef52e416493e6d4c511f70e71de617bee25efb7445b9aba5c861cb628a0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a high concentration of them pointing to disposable hosting and employing UTM parameters, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

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://golowaki.ru/123?utm_term=whatsapp+business+plus
    • https://banafovogakake.weebly.com/uploads/1/3/5/3/135326552/setaned_ligilas.pdf
    • https://nuribivavis.weebly.com/uploads/1/3/4/6/134625990/kizam.pdf
    • https://toxekemugig.weebly.com/uploads/1/3/4/4/134484635/fepitawe.pdf
    • https://vebuleme.weebly.com/uploads/1/3/4/3/134321641/9907799.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_602bafdc6845d.pdf
    • https://static.s123-cdn-static.com/uploads/4381973/normal_5ff92e4b4d6d1.pdf
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fded9851a6fe.pdf
    • https://cdn-cms.f-static.net/uploads/4484820/normal_6014f2b594ec8.pdf
    • http://vemasujananexu.22web.org/honey_bees_information_in_english.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remufuzu/lunowawemaridowa.pdf
    • http://tereneduzoz.epizy.com/graphing_and_writing_inequalities_worksheet_answers.pdf
    • http://lewuxiboru.epizy.com/predator_generator_4000_parts_list.pdf
    • http://wurasegato.rf.gd/cheap_robot_vacuum_cleaner_for_sale.pdf
    • http://beranaja.epizy.com/81103326773.pdf
    • http://bobitemobo.epizy.com/can_t_hold_us_mp4.pdf
    • https://s3.amazonaws.com/vapite/pdf._js_in_angularjs.pdf
    • https://s3.amazonaws.com/pazatuv/73073929471.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin
a2de8bd52642e8afe8bfc5147b2b8562a123c03b5b203ec5a6b9db7e19ed0b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 4964 bytes
font_01_sfnt_off0000fc28.bin
b8eb21b11bca94c872401a2c2fb126c5a03aab32a76c7b756afedf8f56287476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC28 11780 bytes

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