Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb09361ad80912b3…

MALICIOUS

PDF

78.5 KB Created: 2021-06-08 19:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5f70eb9ca557551300d36bc1f265728f SHA-1: 5eec8608009f73932482341262fa20d15b5cd795 SHA-256: eb09361ad80912b3e77b16c4cf9dcd01a4a4b36c596e27e36c896f2d4359645d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The document body, though heavily obfuscated, contains metadata related to IELTS preparation, likely serving as a lure to attract victims.

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://laborke.ru/pbw?utm_term=ielts+fever+academic+reading+practice+test+9+answers PDF link annotation
    • https://noxazevoda.weebly.com/uploads/1/3/5/3/135348256/xebowita.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_5fd848af7dddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_601f99504c600.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/nuvamibubufakoguzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_60be777ae0e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_60bb3cf53d93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_6022a2c47fada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_603ebb3368491.pdfIn PDF document text
    • https://wonefosobafig.weebly.com/uploads/1/3/4/4/134479447/020a94f1.pdfIn PDF document text
    • https://mapadubedebo.weebly.com/uploads/1/3/6/0/136095435/tuwijanulelijij-sebarulu-sogatedopa-woxuwumupawoxa.pdfIn PDF document text
    • https://defugelunek.weebly.com/uploads/1/3/4/5/134524545/dd274.pdfIn PDF document text
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/7908750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_5fda02badfb53.pdfIn PDF document text
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/rutago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144537240/bo4_emblem_editor_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78cdce2-a97d-4d6f-827e-668af7107f0e/69721057742.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/repapuvobigajifatexulot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0820d63d-6abe-4d65-883c-96bf6a256f79/elements_of_art_space_powerpoint.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/manual_kenmore_158_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1273280-421b-441c-ba8a-014d0a4980f4/osha_required_signs.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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 5720 bytes
SHA-256: cef6b29680e9fb5e9dcd0e92ccbaa0b180bc1b9624669606668e7afad1f432b1
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 11244 bytes
SHA-256: 96eb5a31dcc6272e10965f6ba21e8c8e4c47f6d9d64bdf1cac6b5356d8a82660

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