Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbd39ed31b3d91f…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 12:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e5e3d67366438a52c58cc606ce2ead19 SHA-1: d9a9e0ff56236060f9c1bce986272c4bc715ee3c SHA-256: 9cbd39ed31b3d91f1657c9afd93750c108a5cffa240c2b93cd9d0179a6132a16
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDF files, many hosted on disposable domains. This suggests a tactic to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://leonvi.ru/award?keyword=mastering+the+art+of+french+cooking+online+pdf PDF link annotation
    • http://astrohelp.space/first_aid_kit_glastonbury_2017vwwxt.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/fichijb/9904536575.pdfIn PDF document text
    • http://gravkamen.ru/jariwolia08xm.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/hjhpidZ/flights_to_florida_from_slc.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/shhugei/94266602789.pdfIn PDF document text
    • http://free-at.pro/how_do_i_use_my_lowrance_elite_7_tiqwo95.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/hiuH1hb/prizefighters_2._7._6_mods.pdfIn PDF document text
    • http://medyayazilimtr.com/forscan_ford_ranger_spreadsheetne7t6.pdfIn PDF document text
    • http://tomandbxof.site/what_actor_should_have_played_jack_reachernvcjz.pdfIn PDF document text
    • http://premial.su/rofipavwrkm4.pdfIn PDF document text
    • https://cdn.sqhk.co/masezupusi/gjb4ggi/gavulisukefarebefinatoful.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/jcidzih/barrett_jackson_auction_2019_youtube.pdfIn PDF document text
    • http://elerctum.org/the_game_of_life_rulestfkrd.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/nhbMjcL/1017318977.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/zvpgeje/kejemomopulexobobabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_3f6ccea85c124c59b67121acc831015a.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_f5f0e50a3ce045e382f9ce3234f6fac0.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_92f922d1bab84b69ad14f1ae125aea29.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_faf00da0db344c1193628d6cc71e2f00.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_4fc13f75c1394ecdb143001b91e18f23.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_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 5484 bytes
SHA-256: 8258a1992e32399773f2d7b28fbb01c1a52a2937c7ca8cc7cc1a8b7b8a7626f9
font_01_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 10656 bytes
SHA-256: a8ac39e02f2d45fab6ae273615f3ffed37ad7b135a65d38f2fc5811b03586245

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