Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7281e758fc1bca…

MALICIOUS

PDF

78.8 KB Created: 2021-03-03 13:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18fe58bbc6f34ff90f493c04d5ce84b6 SHA-1: d78ec089c48eb6713c221051d6a780b0f4e87730 SHA-256: 6a7281e758fc1bca6007dc2d624b82fbf99e0433be7e35f0c789450d22735ad8
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 0.9998

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://midufefew.ru/123?utm_term=sea+of+monsters+movie+review PDF link annotation
    • http://zuxekagapefe.mygamesonline.org/84656558689.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/bepefewulekok.pdfIn PDF document text
    • https://nipobajomofak.weebly.com/uploads/1/3/4/6/134641158/feniranifar-ginogafuxe-putolupi-zawigunam.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/jipopomevobowemodi.pdfIn PDF document text
    • https://mujugoseboli.weebly.com/uploads/1/3/4/3/134312554/3f08b6a92544ae.pdfIn PDF document text
    • https://ragekadenolobo.weebly.com/uploads/1/3/0/9/130969790/6577744.pdfIn PDF document text
    • http://kabosimoligobe.iblogger.org/tagurusuzadibex.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/can_you_make_iced_coffee_with_a_coffee_maker.pdfIn PDF document text
    • http://viwigevofuwova.iblogger.org/give_the_definition_of_corporate_social_responsibility.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/30132431156.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/lowes_troy_bilt_riding_mower_blades.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/google_sign_in_button_style_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/98844529805.pdfIn PDF document text
    • http://gomupinoteripa.epizy.com/11524993711.pdfIn PDF document text
    • http://zadizufosa.rf.gd/timasotezuxemo.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/21890185860.pdfIn PDF document text
    • http://musubokem.rf.gd/backup_conversas_iphone_para_android.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/kwikset_smartcode_909_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/bauhaus_hv_bt_normal_font_free.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 5136 bytes
SHA-256: b848edb4241282559ea0786370c9899c08cc1092dab43a4e78f99e3c22b5aaec
font_01_sfnt_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 11432 bytes
SHA-256: 03171a7fc0f7a6b9f99c7af6fb316128d5914fbcc75cf119acc6543be2520e07

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