Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca19429ff8219f12…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 03:38:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fb10e5e33929cc1fc35555e1e172704d SHA-1: 3ab64e6829ef264d2d5932e505787d8e83e60b9e SHA-256: ca19429ff8219f12df3819adc0e08febb185a0a4a6faf286995b3be32b13d860
186 Risk Score

Malware Insights

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

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 6

  • 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 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://midufefew.ru/wix?keyword=1.1.1.8+lab+answers PDF link annotation
    • http://confirmyourverifiedbadge.com/formation_brancardier_gratuite_bruxellesg1sg9.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/xDgggXH/cash_diamond_ml_unipin.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/tagejopi_rirevol_guwemimoxuz.pdfIn PDF document text
    • http://fuvosapozos.22web.org/16983324906.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/nikapizisudapunuset.pdfIn PDF document text
    • http://deemonatrafik.xyz/hardest_climb_quotest5t79.pdfIn PDF document text
    • https://cdn.sqhk.co/zosikoto/ToQvc2Y/prairie_sky_falcons.pdfIn PDF document text
    • http://raisinsapp.pro/library_volunteer_interview_questions_and_answershd2w1.pdfIn PDF document text
    • https://gizigega.weebly.com/uploads/1/3/3/9/133999267/nesanow_wetow_kejafadajarar_sasut.pdfIn PDF document text
    • http://perfectiona.online/sample_sheet_illumina_miseqw70g6.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/IcXhjFN/62839552633.pdfIn PDF document text
    • https://muputobiga.weebly.com/uploads/1/3/5/3/135308906/tosagamutiseg.pdfIn PDF document text
    • http://kevareso.iblogger.org/vatijimarojojutulutina.pdfIn PDF document text
    • https://cdn.sqhk.co/leruwexikud/jevidha/16182802032.pdfIn PDF document text
    • http://1xbets-reg.site/format_cd_rw_windows_10lxnf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7fd672c9-0ac8-42d3-9d3c-9ebb2fbea2b4.filesusr.com/ugd/92785a_a7f321b235c04300b58ddd2be54221dd.pdf?index=trueIn PDF document text
    • https://3ae4d138-4ba3-4962-98fb-1b98b40a6a82.filesusr.com/ugd/38062a_cadcae56b7f8430aaa42a0a8f33a0019.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/govukugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/share_capital_and_reserves_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/40797781852.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 5096 bytes
SHA-256: ae79723d1353d893ed010ccdc1643b4eb254b58948178d77d5108468f71a804d
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 10344 bytes
SHA-256: e68652fca52eb7f3032427c45e53eba0ae5c82c9968bd227c2ba6ba4104cfb31

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