Malicious PDF — malware analysis report

Static analysis result for SHA-256 745fd31b66d61e2f…

MALICIOUS

PDF

77.7 KB Created: 2021-06-07 09:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2446aa75a05558df15ae21821f2a2a4c SHA-1: 3f5a1e93414e5454c8b3bbc9ce64fc14d3113bc0 SHA-256: 745fd31b66d61e2fe18bb5d40874e40c5b97b9a3bfab16a384528e55a1e65258
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with a prominent one pointing to 'medvor.ru', disguised as a search result for medical information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a larger network of disposable sites designed to obscure malicious activity. No scripts were extracted, but the presence of external links strongly suggests the document's purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=where+to+put+tens+unit+for+sciatica PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387412/normal_603fdab1a03ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489716/normal_60349ce687545.pdfIn PDF document text
    • https://zugenavupofo.weebly.com/uploads/1/3/4/3/134379337/xodujililumopa_tovata_zipupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_6052e973b37a6.pdfIn PDF document text
    • https://wovotupiw.weebly.com/uploads/1/3/7/5/137502291/nilikur_mavibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_606d55ddc732b.pdfIn PDF document text
    • https://jixepelisu.weebly.com/uploads/1/3/2/6/132695865/4028306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478683/normal_5fdeee77afa2a.pdfIn PDF document text
    • https://gosinixubog.weebly.com/uploads/1/3/4/8/134875818/2760963.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/c0f49d758a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_6069d93b2a70d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409250/normal_5fe42f7518ee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383678/normal_5ffb8ebc594cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosubufegu.pbworks.com/w/file/fetch/144669627/13905498064.pdfIn PDF document text
    • http://redejok.pbworks.com/f/begin_the_beguine_guitar_free.pdfIn PDF document text
    • http://damopijos.pbworks.com/f/canon_mf3010_driver_windows_10_64_bit_free_download.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144740967/has_forrest_fenn_treasure_been_found.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144413934/solving_linear_systems_of_equations_addition_elimination_method_worksheet_answer_key.pdfIn PDF document text
    • http://pitevaj.pbworks.com/f/thinner_this_year_25_sacred_exercises.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/w/file/fetch/144577290/16713463788.pdfIn PDF document text
    • http://nimulivupale.pbworks.com/w/file/fetch/144627612/58409466505.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/applied_research_sample.pdfIn PDF document text
    • http://podixarutib.pbworks.com/w/file/fetch/144623952/90489935200.pdfIn PDF document text
    • http://guleribiko.pbworks.com/w/file/fetch/144623994/mera_bhola_hai_bhandari_ringtone_download_mp3_video.pdfIn PDF document text
    • http://wotasaful.pbworks.com/w/file/fetch/144455451/73123190053.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144437355/mxq_pro_android_tv_box_firmware_update.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_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 5084 bytes
SHA-256: 05b982ae2a870f352429259cc744bcd41f5d9a326e5be8a6f76f7f2ad9cb9bd7
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10432 bytes
SHA-256: d380ca2ade71a3de71dc04acc1d8f14f77f28e5c90591149539b5c83642ef011