Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b7703c3697c84cd…

MALICIOUS

PDF

124.3 KB Created: 2021-03-18 17:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cb9c5e1d6c6a8cafce5330e3563169a SHA-1: 9a50fc2a09e9586660b8fc1267142359d46de4d2 SHA-256: 6b7703c3697c84cd00d443e63b94f3ae66126481357f0b3622f0b72fec09c3f3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable or suspicious domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to a product query, directing users to a URL that likely hosts a phishing or malware payload. The presence of multiple external URIs and the link farm heuristic indicate a deliberate attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/strik?utm_term=does+the+kyocera+duraforce+pro+have+wireless+charging PDF link annotation
    • http://dugules.iblogger.org/pancreatic_anatomy.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/dih4p9i/first_war_of_independence_quizlet.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/haQhahd/domicile_certificate_form_rajasthan.pdfIn PDF document text
    • https://cdn.sqhk.co/gibiganegaz/5iioiuO/6369230025.pdfIn PDF document text
    • http://wativeb.mypressonline.com/attestation_de_prise_en_charge_etudiant.pdfIn PDF document text
    • https://cdn.sqhk.co/negolura/2igN4ZU/36752767845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_605255d187a6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5fe41a75e1e65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_602adb48e42ed.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/joberowikajozetevotev.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/the_book_thief_summary_chapter_2.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/fLHgij7/lizixotuladozupawovobutuz.pdfIn PDF document text
    • http://wupevijijoze.mygamesonline.org/nenabanewob.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/14410400442.pdfIn PDF document text
    • http://nogeturafo.sportsontheweb.net/aliments_alcalinisants_et_acidifiants.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/38463771042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximumipos.rf.gd/how_to_connect_printer_to_wifi_hp_deskjet_2630.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/common_pronunciation_mistakes_in_english_for_chinese_speakers.pdfIn PDF document text
    • http://perowal.rf.gd/por_que_se_produce_el_sangrado_de_nariz_en_nios.pdfIn PDF document text
    • http://vawirir.atwebpages.com/joindre_un_dans_word.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19338 5736 bytes
SHA-256: 3e38204b753aa2ab689e8be20d4df8fcf0e38100227632458ad0e0a21fa03c50
font_01_sfnt_off0001a6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6E2 11572 bytes
SHA-256: c030a2b27e37758d7f84cef0cdaaf1d1801a8ffebef7c897a9630998eb8ef600
font_02_sfnt_off0001ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE28 16076 bytes
SHA-256: 050cca2678d7435c270027ff58d84efa212ea3c5592871ae9bdc0d1e185112d0

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