Malicious PDF — malware analysis report

Static analysis result for SHA-256 deecfbbbb88165ef…

MALICIOUS

PDF

84.0 KB Created: 2021-02-20 17:56:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a9de92fb0e17a38904a737f41d05faf SHA-1: 8b2b45198b007ca1cc2b29f3c921a42235487ecd SHA-256: deecfbbbb88165ef4bfe7d9f2e610ddfa86628f752548896178555003df2e3ec
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment designed to redirect users to malicious content.

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://druttle.ru/strik?utm_term=dyson+ball+animal+2+upright+bagless+vacuum+cleaner+reviews PDF link annotation
    • http://grafoanaliz.ru/dituxaremg4cux.pdfIn PDF document text
    • http://dasuwupozu.22web.org/reforming_the_incorporated_societies_act_1908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_6005dccf6f26c.pdfIn PDF document text
    • http://naxawibumeso.iblogger.org/pozakizalijuzolomon.pdfIn PDF document text
    • http://bewugexujiz.iblogger.org/constitution_scavenger_hunt_answer_key_us_history.pdfIn PDF document text
    • http://reawolt.online/6._deriving_the_short_run_supply_curiluyt.pdfIn PDF document text
    • http://fitdieta.com/first_100_day_plan_exampleb8x7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd389843a568.pdfIn PDF document text
    • http://newyearshop.site/just_dance_4_redeem_code_jd4-nkido.pdfIn PDF document text
    • http://eu-study.ru/hello_neighbor_act_3_magnet_roomqmbet.pdfIn PDF document text
    • https://lowalijadu.weebly.com/uploads/1/3/4/8/134866304/gijebaf_lafotigi_wigibugox_moxarata.pdfIn PDF document text
    • http://2gusevshop.space/importance_of_investigative_reportinggr4jt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366382/normal_5fe3b943b21c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_6025211eef8dc.pdfIn PDF document text
    • http://streamsweets.com/nodanazeralerh68a5.pdfIn PDF document text
    • http://oneitshop.info/famous_quotes_from_alice_in_wonderland_bookuxati.pdfIn PDF document text
    • http://robinmani.site/fudumikaverobedujykf3p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fekerudosepu.rf.gd/tenia_pisiformis_ciclo_biologico.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_off00010896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10896 5872 bytes
SHA-256: 847d56f6a6103089989447502e672be6bc89723b3473c1f40af5c9d5ed00cbca
font_01_sfnt_off00011c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8B 11028 bytes
SHA-256: 435b61b361c61d7b530519ec973a9347f60d03f0acd55737f8c1437a0cf97cc9

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