Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c81e9169e6cc80…

MALICIOUS

PDF

79.9 KB Created: 2021-03-22 12:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 1a4f804d0cf0c9a42d43d6cf3cd420ae SHA-1: 1cd52d016f17d48cbb4b0688e5a9c2ff9ddd1538 SHA-256: 00c81e9169e6cc80a70060dd04943e0bb624c825efe77cfc9ec7a81dad1f09b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting, a strong indicator of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=workplace+safety+and+insurance+act+ontario+pdf PDF link annotation
    • http://redit.fun/dell_3100cn_service_manualxz4xr.pdfIn PDF document text
    • http://malowatava.iblogger.org/kofuderasulizipo.pdfIn PDF document text
    • http://sun-italy.space/tiny_archer_mod_apk_latest_versionzfptl.pdfIn PDF document text
    • http://santecmb-sarl.com/50441804551whayg.pdfIn PDF document text
    • http://tobepotalesozaj.22web.org/information_technology_specialist_1_interview_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/gofuzurafano/hyNjjgh/sasaz.pdfIn PDF document text
    • https://vefawotujetebab.weebly.com/uploads/1/3/4/6/134651081/xuronumapamamif-xoraxajozosemu-dusak.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/kibove_vegekadediro.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/eUjdShb/pilomatrixoma_right_arm_icd_10.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/haiiVgd/88213222603.pdfIn PDF document text
    • http://my-favshoph.online/current_india_news_livedxknl.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/bozuw-xukemidez-buliditizonis-nivubemovol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovuzize/81592858043.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_093a009acaab4613b715382e1fa5538c.pdf?index=trueIn PDF document text
    • http://vezuzatutuxi.epizy.com/attack_on_titan_game_apk.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_f13632a6ae2149b8baec5ef22e6abde2.pdf?index=trueIn PDF document text
    • http://garuwefusu.epizy.com/10973992399.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_a0d99928bcda4a3fbaceca8920adc138.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesotat/28562550165.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_7f524ba54024498b96968d5898858292.pdf?index=trueIn PDF document text
    • http://talaxevavilur.rf.gd/lettering_templates_for_applique.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_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 5328 bytes
SHA-256: e812f2a9563e76311bea665f37198f043fe2db13fd292b2ed2fe821805990f1b
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 10336 bytes
SHA-256: 1dfe72c4985f935d89b99a00030573212d2ba59e521c2fcdf6ccee8b38a4a02c

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