Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb8edc6f2eddf41…

MALICIOUS

PDF

73.1 KB Created: 2021-06-11 10:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 099e686955ffaacc59e141bcf3d0f62a SHA-1: 12635cba46345f8b780eba91d21aed44ddd50d24 SHA-256: 5cb8edc6f2eddf414c6a4eaa314c981e8179d7eb015480683672cf29faae9041
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The primary malicious URL identified is 'https://medvor.ru/pbw?utm_term=es+file+explorer+pro+mod', suggesting a phishing or malware distribution attempt disguised as a legitimate software download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://medvor.ru/pbw?utm_term=es+file+explorer+pro+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407804/normal_603886e46053a.pdfIn PDF document text
    • https://xidawelopumez.weebly.com/uploads/1/3/4/4/134439163/pirona.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_606c12048582e.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/xagozisamef-nesuzix.pdfIn PDF document text
    • https://vudepupebowazuk.weebly.com/uploads/1/3/4/4/134472779/78b2d10b9789.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/fabaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411917/normal_606a9d815aff7.pdfIn PDF document text
    • https://bofazereb.weebly.com/uploads/1/3/4/6/134675062/jinawesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_6034261059a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_603f9ca387da7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatunam.pbworks.com/w/file/fetch/144666702/zofenufonakufukepivov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f64e3ab9-e1cc-4263-8bd3-becc63d1fe01/revakokuzi.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144941043/free_ocr_to_text.pdfIn PDF document text
    • http://zumejukikug.pbworks.com/w/file/fetch/145111101/kid_cudi_man_on_the_moon_2_zip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c7bd00-deb9-4eb5-ae29-2b3ae4d89711/xuguliwomebewib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8578de-84af-4b3e-9303-cc92ab087acf/zenalisozujabuwumukowuv.pdfIn PDF document text
    • http://mokapuv.pbworks.com/w/file/fetch/144612099/54141569606.pdfIn PDF document text
    • http://naxenuve.pbworks.com/f/the_shape_of_water_subtitles_for_russian_dialogue.pdfIn PDF document text
    • http://resewoxe.pbworks.com/f/masoletobapoxulanorebagop.pdfIn PDF document text
    • http://farejutotej.pbworks.com/f/xalaz.pdfIn PDF document text
    • http://najajufuf.pbworks.com/w/file/fetch/144762342/24785802943.pdfIn PDF document text
    • http://zudilazo.pbworks.com/f/58602465308.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/f/important_days_for_competitive_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef9382e-5caf-4a0a-9a60-95ddc0fb3790/23349292217.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 5004 bytes
SHA-256: 1886cdcfdb54e0bda61597af043afd5b653f505838bc3d37dd6074bcaa040783
font_01_sfnt_off0000f4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EF 10076 bytes
SHA-256: 9d95f21c6e9f7faae24c058880fd96d1e183e996c9b458928c8e200ec03fb956

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