Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0cb0efcb01d986…

MALICIOUS

PDF

72.2 KB Created: 2021-03-14 07:51:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cc9de457bd550fe7384eaae61154b34 SHA-1: 21bd79b50a0ebb41c6269b10ee5e824ce75732c7 SHA-256: 4f0cb0efcb01d98648e1488c90c84eb4c6ae311268eea4518096e6dcdb10b180
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://druttle.ru/123?utm_term=manometer+problems+with+answers PDF link annotation
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/pegofubumelotakaxe.pdfIn PDF document text
    • https://rarasaxemog.weebly.com/uploads/1/3/4/6/134611000/pagonivupivowelego.pdfIn PDF document text
    • https://gaxurorilapuw.weebly.com/uploads/1/3/2/3/132302857/malejafe_zodub_molafotig.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/965662391.pdfIn PDF document text
    • http://pobunav.sportsontheweb.net/lowes_harbor_breeze_ceiling_fans_with_lights.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/wuziv-mijiv.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/81ad1.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/wheel_of_time_book_13_download.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/3996291712.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/apple_store_guidelines.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/8e7ab9efa.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/wixamupelinere/xkit_physical_science_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/dove_soap_guidelines.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_0d50093bee324bb6b9b6c35ab93064f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/galatea_madeline_miller.pdfIn PDF document text
    • http://sewejatoxomo.rf.gd/business_plan_d_un_hotel.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_c87a80da805d44969e209a3aa04d34bb.pdf?index=trueIn PDF document text
    • http://juxenemijoguku.rf.gd/64393167044.pdfIn PDF document text
    • http://waxobutadarase.rf.gd/calibri_bold_italic_font_dafont.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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 5296 bytes
SHA-256: 696ca88a9c9d0cc8749651ff7eedf8d348b47ed4dc582915e6298fdf750f1616
font_01_sfnt_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 11820 bytes
SHA-256: 93cda65f343f63d5ca77ea55202af61cf1e23de9078c9573c7cfd6b246945e2b

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