Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0a4bc68c1f2790…

MALICIOUS

PDF

91.3 KB Created: 2021-05-23 07:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c7c0dcc30b0b12cae675e3fa57ed6b8f SHA-1: 529e331311a9b7e6b2c7668329330e7bab913d90 SHA-256: 9b0a4bc68c1f2790e157d7a8445a8bd15ffe41684e62834e6e4b86d6c55b2cbf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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 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.
  • 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://pelibifir.ru/strik?utm_term=programas+em+linguagem+c+resolvidos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481400/normal_60548dfc9c2c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450890/normal_6068c63ce5fcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_5fd90fa03077b.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/8286064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426260/normal_601101e0050f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_6020d2fe37546.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369152/normal_5ffa95e58735b.pdfIn PDF document text
    • https://ligapixoxos.weebly.com/uploads/1/3/4/3/134378271/woputewuz_balinefabafufak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lulelepese/what_does_economic_activity_mean_in_sociology.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/junajafasava.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/surviving_the_dust_bowl_video_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/gurifofigonulewemibal.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/how_to_read_american_standard_air_conditioner_model_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/what_grade_level_is_flat_stanley_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/44907283626.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/transformers_barricade_the_last_knight.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/matetep.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/dark_souls_pyromancy_flame_upgrade_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/medicare_guidelines_for_hospice_dementia.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/70496886560.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/kumetisusarubo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B87 5320 bytes
SHA-256: 3fcf6b98e03bc782667c1eba80af283117dd8fc9aa437b9a969e465fa58d7f6d
font_01_sfnt_off00011d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 14000 bytes
SHA-256: 5822b2e4c3e9dfbc51b769753b22897c1eebaf67734fc1a3e425bf77c599a04c
font_02_sfnt_off000148f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F8 16144 bytes
SHA-256: fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78

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