Malicious PDF — malware analysis report

Static analysis result for SHA-256 314105737dc941a8…

MALICIOUS

PDF

75.4 KB Created: 2021-03-23 00:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 989cd06775511f8cbe04cc22c6f878b8 SHA-1: 12e4a002510f8e5ceaa471142982e70de710a2a2 SHA-256: 314105737dc941a86e9f91fc899fe0f833a18d25050e7cccd2ec62a132e5048d
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 0.9996

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://pelibifir.ru/award?keyword=linear+algebra+problems+and+solutions+pdf PDF link annotation
    • https://dudakodut.weebly.com/uploads/1/3/4/4/134497067/kinisamawuj-pidanuduxi-fezulilawe-bibusoj.pdfIn PDF document text
    • http://fevozogu.iblogger.org/storyboard_software_free_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hcgj3Sp/4795695822.pdfIn PDF document text
    • http://bubuletigesin.iblogger.org/measurement_conversions_worksheet.pdfIn PDF document text
    • https://zotolibufu.weebly.com/uploads/1/3/1/0/131069899/71d17c.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/iehc9hh/telehealth_therapy_ideas.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/how_many_mesopotamian_gods_are_there.pdfIn PDF document text
    • http://limowoduramu.iblogger.org/android_open_file_chooser_intent.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/sSr3pjj/come_creare_uno_sticker_di_whatsapp.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/how_to_use_code_breaker_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/jaghgBE/learn_to_code_html_css_and_javascript.pdfIn PDF document text
    • http://jukojadijomefar.medianewsonline.com/57157107322.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/kulijabugolewokog.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/558091.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/chey8Pd/kupekifefixita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_1c55dfc391d84783a8807eba50f7b576.pdf?index=trueIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_c444bb4a338b404f94e58e30cce5130f.pdf?index=trueIn PDF document text
    • http://vedewujesog.rf.gd/41007472342.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_f43aa112e169419cafe06eed304cc224.pdf?index=trueIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_12f88e657fe146009f008132d0051cf5.pdf?index=trueIn PDF document text
    • http://muvamubas.atwebpages.com/fuxekijoxusotatefoxe.pdfIn PDF document text
    • http://sozasolo.epizy.com/kavizofunogubopora.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_off0000e42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42D 5444 bytes
SHA-256: f8ffba570de85e09867c721f33ae03c6ceb7df9e7c1b02ddcccf7a83d74d0c6a
font_01_sfnt_off0000f699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 11708 bytes
SHA-256: 6a745debed16c4cdbffd6f064a36ddbeaf6b635d4eed379eba7e5f76e8b89463

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