Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb669739340d8deb…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 06:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7a7a7e6736658dccc67af29cc826c241 SHA-1: 9f1e7e80d7f8ec2bf9cc5f4b279c198db79abb1c SHA-256: cb669739340d8debd316fd250e30c76e32ca8bc582b44d041ba9f1ab1ca4a11a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=edit+pdf+freeware+portable PDF link annotation
    • http://nukels.xyz/barrett_jackson_2020_results_fridaya6ax5.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/35ca96684.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/2c5b72fc8ba3a00.pdfIn PDF document text
    • http://wezugeviliwibu.iblogger.org/critical_race_theory_questions.pdfIn PDF document text
    • http://nunedarozozo.22web.org/fujuvesomejufadixokebobof.pdfIn PDF document text
    • https://pedudevapo.weebly.com/uploads/1/3/4/7/134719514/9804628.pdfIn PDF document text
    • https://natapuwofase.weebly.com/uploads/1/3/1/8/131857101/rudat-sewere.pdfIn PDF document text
    • http://ledy66.net/87755815331v7ulx.pdfIn PDF document text
    • http://lg-copyrightforms.com/carol_of_the_bells_piano_sheet_musici1dox.pdfIn PDF document text
    • https://pesopipuni.weebly.com/uploads/1/3/2/3/132303043/662957.pdfIn PDF document text
    • http://techanomic.com/72260853906r19of.pdfIn PDF document text
    • http://arfesopt.com/foxagirunorb53lr.pdfIn PDF document text
    • http://theporte.xyz/xokumop1bb8.pdfIn PDF document text
    • http://igonlinesupport.com/ferokafe50uw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_f9d07626fc434196ae7ccb359cce1fb3.pdf?index=trueIn PDF document text
    • http://tefuguwo.epizy.com/9965747593.pdfIn PDF document text
    • http://gowasikokini.epizy.com/asp.net_mvc_listboxfor.pdfIn PDF document text
    • http://borogibapomad.epizy.com/jutumowuwasiti.pdfIn PDF document text
    • http://zozusanom.epizy.com/39795064372.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/capemisa_informe_de_rendimentos.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_9e665bd943d04ac0840d0f85900a37d6.pdf?index=trueIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_7c70d2bbf6f541cbbcad347a803ed83f.pdf?index=trueIn 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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 5048 bytes
SHA-256: c7728943488b8361500e1592cc42291f3a51f7d9dc4286c9048b665e6d4810c4
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 10464 bytes
SHA-256: bc424b9da8293206c4ef2bc2b567c0edc9e6c347d5a164ebed3aca6437e43c89

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