Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f671c38edc7c18…

MALICIOUS

PDF

84.0 KB Created: 2021-02-15 16:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1d8321a6e312bdefe0943bb3b2871b4a SHA-1: 38e227c0c7e8616053282e27cbb98f6408b22368 SHA-256: 51f671c38edc7c18008cb58e9d8bced3adb0c4b11e9d1072bd02ecec89c58a1f
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 0.9997

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/strik?utm_term=percy+jackson+and+the+lightning+thief+book+chapter+6 PDF link annotation
    • http://webmastervlad.ru/client_information_sheet_bpikq3vu.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/baboxi.pdfIn PDF document text
    • https://cdn.sqhk.co/punenekebi/ar2tgic/iphone_text_message_sound_free_download.pdfIn PDF document text
    • http://ingmijn.com/candy_corn_template_to_printgmg4f.pdfIn PDF document text
    • https://gegiritofizupog.weebly.com/uploads/1/3/4/6/134644009/5031654.pdfIn PDF document text
    • https://jatevabuxises.weebly.com/uploads/1/3/5/3/135382810/senebojisigulamuxijo.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/aKjbM2C/48334253955.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/218706.pdfIn PDF document text
    • http://omoikiri.info/rijapimilulsf2rg.pdfIn PDF document text
    • http://shoop-fk.ru/construction_site_inspection_report_docprjyr.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/isih1je/shopdisney_baby_yoda_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/hgKehiY/3d_origami_face_mask_for_sale.pdfIn PDF document text
    • http://gusanod.22web.org/netuzadewiri.pdfIn PDF document text
    • http://mivukiwoluwuj.iblogger.org/anhydrous_lactose_usp_monograph.pdfIn PDF document text
    • http://businessoutsourcing.info/87295837572vwfba.pdfIn PDF document text
    • http://dmgameplan.com/wefakir95mhy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesujenomudot.epizy.com/6620696372.pdfIn PDF document text
    • http://beturatigamoli.epizy.com/sotuzetokonazaximixijefe.pdfIn PDF document text
    • http://falafujofubopes.rf.gd/xejudiraxefaretunaf.pdfIn PDF document text
    • http://nisoruv.rf.gd/39997134015.pdfIn PDF document text
    • http://wazuvit.rf.gd/taxewekexurikizugedogej.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_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 5952 bytes
SHA-256: 6aeb3ad05f84955bd9144c58dc7beaf36fd6319dc2b4d7326a420c7fd5f9241a
font_01_sfnt_off00011ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC2 10560 bytes
SHA-256: 1cd4772f1400dabfe943ae26c29c51916209673b341a869745ea4b6e1219a349

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