Malicious PDF — malware analysis report

Static analysis result for SHA-256 9844d109e95a3491…

MALICIOUS

PDF

73.2 KB Created: 2021-03-20 22:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d053c6824c74fae64b029e5f148c50eb SHA-1: b8f1b25586706bd377a690609bc2087d02eb994b SHA-256: 9844d109e95a3491f26216ab8b98d4837ec70deea8b8f61de56fd67c6e2f9f42
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 link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=avery+4x6+labels+4+per+sheet+template PDF link annotation
    • http://auto-agents.space/how_much_oil_does_a_ariens_24_compact_takedyu7w.pdfIn PDF document text
    • https://zoriliwusitilo.weebly.com/uploads/1/3/4/4/134479822/lirivusojolu.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/fanilakivimitifito.pdfIn PDF document text
    • http://reawolt.online/92657666655z70l0.pdfIn PDF document text
    • http://pexiwaz.iblogger.org/fizemavub.pdfIn PDF document text
    • https://cdn.sqhk.co/gilitejeku/h8jhwgI/pokemon_explorers_of_sky_character_guide.pdfIn PDF document text
    • http://fc-aromat.ru/167880199654gu1x.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/U7ZNkG1/34144998927.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/robert_frank_the_americansw0l0e.pdfIn PDF document text
    • http://pro-konditer.com/71334328959ij1h7.pdfIn PDF document text
    • http://lavkavkusa.store/podejawikoxafukabapekafzeqov.pdfIn PDF document text
    • http://spencermcman.us/gedivupojehh6kh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rolefosiju/86480659535.pdfIn PDF document text
    • http://wadirezox.epizy.com/80736678014.pdfIn PDF document text
    • http://tedivepi.epizy.com/cs_go_aimbot_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/76071329351.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/samsung_galaxy_note_9_user_guide.pdfIn PDF document text
    • http://sajififavaw.epizy.com/american_journal_ophthalmology_case_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/nujubu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 5184 bytes
SHA-256: 0437959cc75a9624e366139cac8b01940b4006edbf42fccf4ca6b05b5a3f2a9a
font_01_sfnt_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 10896 bytes
SHA-256: c06f2f0d916500294ba787edb47d314f9c0849834a5ba482df44137be7801e97
font_02_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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