Malicious PDF — malware analysis report

Static analysis result for SHA-256 9767bfb3b7309e56…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 14:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 380632fb2e3d39b3fef6a0e3f5265179 SHA-1: 63d25f5dc20c0d51d3a23592cc8c058f3c2cd978 SHA-256: 9767bfb3b7309e5604bd5555207667479eb63e28fb3a33502a3a7751d4c8482e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly legitimate ones. The primary IOC is the URL 'https://ponafet.ru/strik?utm_term=how+to+clear+one+touch+ultra+mini+memory', which is directly referenced in the document's metadata and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=how+to+clear+one+touch+ultra+mini+memory PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491398/normal_604ed5607dd42.pdfIn PDF document text
    • http://counterman.ru/kelewerudijufowegaxn7e3.pdfIn PDF document text
    • http://secureappeal.com/the_monologue_audition_karen_kohlhaas57bzu.pdfIn PDF document text
    • http://bonboxstudio.com/50266495904b7s6o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468531/normal_60210ae8ca127.pdfIn PDF document text
    • http://comp-arenda.site/utorrent_pro_cracked_apk_onhaxw1mni.pdfIn PDF document text
    • http://item-mask.top/agreeing_and_disagreeing_phrasesryjgx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469831/normal_6055ed453ee36.pdfIn PDF document text
    • http://aazzzry.space/totadcsdd6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ffdadbc8e0c1.pdfIn PDF document text
    • http://virnet77.ru/in_the_bleak_midwinterdayws.pdfIn PDF document text
    • http://topsalon.xyz/81138490731bhayg.pdfIn PDF document text
    • http://itsamorem.com/iris_card_scanner_software_free_downloadelhyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502464/normal_6027bcb912b57.pdfIn PDF document text
    • http://dithetsen.xyz/428692234304g34m.pdfIn PDF document text
    • http://sarkife.site/95863248360zqzav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dd92c4-9248-4f57-9a55-edc73c499142/xobevilowivujoxofuvos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aca358e-5d84-4eea-bcb6-47be3f7a8473/99206853539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8165f314-ccc5-4392-8909-65eaf070ea47/english_grammar_tense_formula_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348c8b6b-7cca-4937-b057-0348fbed8163/p6x58d_premium_bios_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a67328-08ef-4357-828e-74f997a6d7cd/king_lear_characters_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e13582-beaf-4759-9d6e-2bbab113e9fd/87083805322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3551cabb-24a4-464a-9cb8-2883f0c38557/black_and_decker_rice_cooker_instructions_brown_rice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ea08b4c-873d-4c9d-9262-66b97e4c9be0/death_note_light_yagami_becomes_a_shinigami.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_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5016 bytes
SHA-256: 9920438a947ad9e7c7428187a492e1eb2354fb7d9851b05f36be31647bbd12f4
font_01_sfnt_off0000fd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD70 11296 bytes
SHA-256: 10e8cc2addf9bd0a43b5f6286f9e536c18d60839cd5a07b83a150743024dd5c2