Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb3b421471bcc14…

MALICIOUS

PDF

80.4 KB Created: 2021-04-10 20:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3346208aa6d80e9fc455e7c5faf71eb5 SHA-1: edb18c07a76e6e54bda4cc2d9cbc2daebdba60a5 SHA-256: ecb3b421471bcc14b62240615658788aa47f1c7271a178facb6ebaebabb0ca91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://dugedepap.ru/strik?utm_term=how+do+i+change+the+frequency+on+my+hunter+fan+remote PDF link annotation
    • http://opt05.ru/learning_english_for_beginners_booky893s.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/iajdjeT/jefokejefejov.pdfIn PDF document text
    • http://train-home.ru/42467942728pbb8x.pdfIn PDF document text
    • http://linorusani.iblogger.org/ajax_post_form_data_to_controller.pdfIn PDF document text
    • http://appletopshop.ru/dijozotugereduloduwukavjybev.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/esifUhg/47271665633.pdfIn PDF document text
    • http://geosen.net/inside_the_criminal_mindes635.pdfIn PDF document text
    • http://dlkmvkoenv.info/tezikuvanunaztdoy1.pdfIn PDF document text
    • http://connexion-amelii.xyz/59996419668pn8bc.pdfIn PDF document text
    • http://latencfsrt.space/kepulujegofaobehh.pdfIn PDF document text
    • http://gufutaca3.xyz/brother_hl_2140_toner_cartridge_refill6adj5.pdfIn PDF document text
    • http://gravkamen.ru/how_much_is_carlton_cole_worth3tpvt.pdfIn PDF document text
    • http://goxufedem.22web.org/malcolm_baldrige_self_assessment.pdfIn PDF document text
    • http://adv-workshop.site/29747043572w5dmx.pdfIn PDF document text
    • http://best-ital.fun/jackson_kayak_fun_runner_70cgkde.pdfIn PDF document text
    • http://pollsexpert.com/dapodisumakogudekexorar7zb0s.pdfIn PDF document text
    • http://nugabuxawepeliw.iblogger.org/byzantine_court_culture_from_829_to_1204.pdfIn PDF document text
    • http://jumitom.22web.org/23439871079.pdfIn PDF document text
    • http://gukibiminaz.iblogger.org/is_breakfast_sausage_pork.pdfIn PDF document text
    • http://lovewaits.ru/66737925854ubux.pdfIn PDF document text
    • http://kernig.online/57565134324zhc7v.pdfIn PDF document text
    • http://prognoz-football.club/738661845027myd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 5504 bytes
SHA-256: 549d4c31c6d981db0613892cc9cb9be532ebf4ba34b41f7c5f28a254686b398a
font_01_sfnt_off00010e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E76 11032 bytes
SHA-256: 48548698d9576abb9884e8233be5b4864f25929f683f578cb9d7459c4bbc42f1

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