Malicious PDF — malware analysis report

Static analysis result for SHA-256 f473f92eeb5906d9…

MALICIOUS

PDF

80.8 KB Created: 2021-04-05 18:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a6a5939b9efc1b4c4ecf056c6260c287 SHA-1: 0192f493b2b09467f1f5369dffe65a5bf3991833 SHA-256: f473f92eeb5906d937f05ec9f3352aaa5bbbcb98f0d8d167eda42c8ebb26749a
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=innisfree+free+sample+code+2018 PDF link annotation
    • http://rimiripa.mypressonline.com/b_lactamines.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/1686577.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/17091526409.pdfIn PDF document text
    • http://nufivuzelikonax.getenjoyment.net/centennial_college_progress_campus_map.pdfIn PDF document text
    • http://nuvotana.22web.org/epson_stylus_photo_1400_printer_ink.pdfIn PDF document text
    • http://sesesuruko.mypressonline.com/bissell_powerlifter_powerbrush_not_picking_up_water.pdfIn PDF document text
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/livoguxapi-fodozepiwumin-pofobipetikinus.pdfIn PDF document text
    • http://zoguponuwuxoli.medianewsonline.com/autoretrato_sin_mi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_fa1d8e35be4a4999a8b1a3172fbad954.pdf?index=trueIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_00d6aed3dbf248559ad2beeb7f87fd1d.pdf?index=trueIn PDF document text
    • http://sezatubokapalut.epizy.com/adding_integers_free_worksheets.pdfIn PDF document text
    • http://xanijidul.epizy.com/linapomip.pdfIn PDF document text
    • http://bekusisit.atwebpages.com/rulowemevuwuxokefi.pdfIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_5f2d7d7379c94b81932f8b0ffd7a4ce5.pdf?index=trueIn PDF document text
    • http://nudagimanefej.atwebpages.com/slaba_tnica_y_slaba_tona.pdfIn PDF document text
    • http://xifenarubomes.rf.gd/gobidomafoxudefa.pdfIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_8bc63980ff53489495191e8cc71bd697.pdf?index=trueIn PDF document text
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_3cd5cf25c74c414aa19ff1891cd63ded.pdf?index=trueIn PDF document text
    • http://tovanafinavo.rf.gd/bsc_1st_year_mathematics_notes.pdfIn PDF document text
    • http://wekidezeze.epizy.com/background_remover_photoshop_free.pdfIn PDF document text
    • http://kesobikifa.epizy.com/71867465080.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_off0000fdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 5756 bytes
SHA-256: 33cc3c16b1f9f2b9fb3ebc35608a3f33abc01389d3816848de03b0974e9a2750
font_01_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 10684 bytes
SHA-256: 918da175691cc84ebe0a95646cd48bf1cea26672f88720301d6dd76a132fd331

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