Malicious PDF — malware analysis report

Static analysis result for SHA-256 26765c1a0ec1c41e…

MALICIOUS

PDF

70.8 KB Created: 2021-02-17 23:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4590349e6e1cd8c80e9fc9e338d0be25 SHA-1: eb050bb6540722942b4a6fd7a3540f660f7261aa SHA-256: 26765c1a0ec1c41e6572e0f1c8f9ee455a1d074f0657ba919bd51c508ac042d4
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 0.9998

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://leonvi.ru/123?utm_term=how+to+set+my+water+softener+hardness PDF link annotation
    • https://cdn.sqhk.co/vawupemowa/cu5jjjf/colem_deluxe_complete_colecovision_emulator.pdfIn PDF document text
    • http://zewamiluwevegif.22web.org/ralevutaxuzudugoxaxekil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5ff12e9d72de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455396/normal_6013be3fdc347.pdfIn PDF document text
    • http://fejazeluxuz.22web.org/professional_cv_format_for_sales_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/VhdRjaz/34483342910.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/CTwijhh/smashy_road_wanted_2_cowboy_standoff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410222/normal_6009c859efd97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5fc9a6dfeda76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fe91638ea2cb.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/vobefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_601006af0cbc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memavopunon.rf.gd/32973257823.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/free_year_end_function_invitation_cards_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/79270675378.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/vilomolofumoluzoluvamona.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_off0000d80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 5268 bytes
SHA-256: 87c4da76793c42f73e68a518dac8aa34b735926e5be66ebc68d97a9872e79deb
font_01_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 10640 bytes
SHA-256: 9d57762572e45661732228b4692c002da25a8329e440a91eeb155ee1045fe146