Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69cfd3ebf6bf76b…

MALICIOUS

PDF

81.8 KB Created: 2021-03-18 17:12:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9e8f40d0f8e02451ad0f0f9f212139f SHA-1: bf27f481ce4b8757255c5451f6303b3edb556a3a SHA-256: b69cfd3ebf6bf76b2813441e2dc13258c69c2189fe7d3faec3fb398354ebc8f1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that form a link farm, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to numbers and the wkhtmltopdf tool, which is often used to generate PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=para+que+sirven+los+numeros
    • https://cdn-cms.f-static.net/uploads/4403687/normal_601a1c839e329.pdf
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/jazipuw.pdf
    • http://fufodew.22web.org/lisufaxatamimirodaf.pdf
    • https://cdn-cms.f-static.net/uploads/4368489/normal_6035b516b8db0.pdf
    • https://cdn-cms.f-static.net/uploads/4407304/normal_5fd65e9ca6bb8.pdf
    • https://static.s123-cdn-static.com/uploads/4368949/normal_60021a805c305.pdf
    • https://cdn-cms.f-static.net/uploads/4451210/normal_602a0408dd663.pdf
    • https://lonokowikur.weebly.com/uploads/1/3/5/3/135384913/wegifakavofu-jakizusomimiv-ruxinogebi-xilurubuselal.pdf
    • http://bibivire.mygamesonline.org/puxuze.pdf
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/2735666.pdf
    • https://static.s123-cdn-static.com/uploads/4369191/normal_5feb9ee7bfdda.pdf
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5fe1b87c39c6e.pdf
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/8ba6ff83c.pdf
    • http://desokore.medianewsonline.com/charles_capps_youtube_angels.pdf
    • https://vesilaxevi.weebly.com/uploads/1/3/4/7/134735958/wotijuja.pdf
    • https://static.s123-cdn-static.com/uploads/4374699/normal_600072ba19c5b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/686a07f4-b4f1-4db3-89b5-813ceb6e92d4/bidomiminijal.pdf
    • https://uploads.strikinglycdn.com/files/2a9b100c-1d91-4931-ac61-3de9e74d92ba/who_wrote_the_book_of_the_bible_john.pdf
    • http://wokarodefi.onlinewebshop.net/33821523478.pdf
    • http://zudupaxub.myartsonline.com/gasan.pdf
    • http://bamonoxo.onlinewebshop.net/24167170742.pdf
    • https://uploads.strikinglycdn.com/files/ecaecb7f-d534-4234-904c-b809d13f3e0b/marketing_digital_que_es_y_cmo_funciona.pdf
    • http://juwemijawikipo.epizy.com/wokujoporufejufemorope.pdf
    • https://uploads.strikinglycdn.com/files/71376ffc-3641-4b08-8d69-a78b06775cb7/sharp_objects_trailer_2.pdf
    • http://vavuliremu.rf.gd/how_to_use_a_warm_mist_humidifier.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_off0000fdeb.bin
59a06c6932b3175c99a33f4271bf1205c5d22443a17222aff2d2123cbe3cb59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 5016 bytes
font_01_sfnt_off00010ef0.bin
b2e159aea58dc2a48cb262b51243148ed3e74921711852c1f60622436636387c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 12700 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.