Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d15d94838ffb7d…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 04:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 322a7dd042a5b0a44425c9dc492259e8 SHA-1: 7b76180afbbc277b94cd969d456cd38320eb9d62 SHA-256: b0d15d94838ffb7dc1d1973438fa16272e17a57ad6a6ebbaf944d2cdb833bd00
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, with URLs like 'https://lozipotod.ru/123?utm_term=the+other+side+of+the+mountain+book' being prominent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

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://lozipotod.ru/123?utm_term=the+other+side+of+the+mountain+book
    • https://jelalepoxona.weebly.com/uploads/1/3/4/9/134901657/welafujeluge_dagepenaropi.pdf
    • http://sberin.xyz/1008_names_of_lord_vishnu_downloadxrdbm.pdf
    • https://torudedo.weebly.com/uploads/1/3/4/3/134352944/dexavewuvake_dimesuxusudul_vadasup_dabewisapulopu.pdf
    • https://cdn-cms.f-static.net/uploads/4410013/normal_600bb28f6f388.pdf
    • http://mosebuzixat.mywebcommunity.org/349007943.pdf
    • https://cdn-cms.f-static.net/uploads/4458840/normal_601760f61a8cd.pdf
    • http://paselon.getenjoyment.net/vobamolujevelusa.pdf
    • https://cdn-cms.f-static.net/uploads/4372702/normal_60150ac971bd7.pdf
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/8bf1a799a66d.pdf
    • http://akfb.online/chrisfix_car_buying_guideijp5l.pdf
    • http://tulavesew.getenjoyment.net/operations_management_heizer_chapter_10_ppt.pdf
    • https://tuxupifogufo.weebly.com/uploads/1/3/4/5/134594750/vepemuwaxivamu_kemalekunupelo_pibawegabilo.pdf
    • http://lololoj.sportsontheweb.net/23673800017.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fajazimigig.atwebpages.com/lofezugizujipixitu.pdf
    • http://nibubatovavav.atwebpages.com/ritogatekezevuni.pdf
    • http://pimoxonevuwewax.atwebpages.com/connect_wd_my_cloud_directly_to_computer_ethernet.pdf
    • https://s3.amazonaws.com/batoragubukepo/banque_internationale_a_luxembourg_financial_report.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_off0000f69f.bin
95287dc58291147a14d391c1edae52f8fd9066bafd48e9cb8aab2fa059417901		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69F 5268 bytes
font_01_sfnt_off00010855.bin
97fcbe5a269317780a4b90e20cf1159391e0549528f55f3f84e1fd35357b1f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 11140 bytes

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