Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a8aefc0ad87ff8…

MALICIOUS

PDF

85.9 KB Created: 2021-04-29 23:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4b435456fd2b6a9bc546d6d4bf235ba SHA-1: 1e17351c087b1f3919dcd4e64a3ddcf7fcd48ef7 SHA-256: 75a8aefc0ad87ff81221f76c85544cac930fd9ff6bc10e577e63dea6ae93d20c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ML classifiers as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or redirection strategy. The primary URL, https://botokaw.ru/strik, is likely used to host or redirect to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=how+to+fix+water+softener
    • https://cdn-cms.f-static.net/uploads/4424683/normal_5fea10bbe8888.pdf
    • https://fafidapumexeri.weebly.com/uploads/1/3/1/4/131437561/rajagegosuz.pdf
    • http://gewewenaso.iblogger.org/brain_parts_and_functions_chart.pdf
    • http://gusevoxuzuwelap.mywebcommunity.org/53072202223.pdf
    • https://cdn-cms.f-static.net/uploads/4459164/normal_605dd0002be1b.pdf
    • http://nagetav.22web.org/rosogusipitafesuv.pdf
    • https://vutofuwejazow.weebly.com/uploads/1/3/4/3/134321520/vuboz-zokevazazu-rovinapeboxopox.pdf
    • https://momukilogavar.weebly.com/uploads/1/3/1/4/131437465/kufod.pdf
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/jazolarijirunimubo.pdf
    • http://fajasated.mywebcommunity.org/fci_answer_key_2020_download.pdf
    • https://cdn-cms.f-static.net/uploads/4451220/normal_602c5307d5d25.pdf
    • http://xazupadapafow.mypressonline.com/ludiga.pdf
    • https://static.s123-cdn-static.com/uploads/4495855/normal_5fe5bcb56ffe9.pdf
    • http://korixoludofuguk.scienceontheweb.net/mawelopebigovujagibekid.pdf
    • https://cdn-cms.f-static.net/uploads/4366405/normal_604866c714b85.pdf
    • https://cdn-cms.f-static.net/uploads/4474979/normal_606b11c2ef8cb.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd3ab676cc0f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/doxifuba/xewumosafexo.pdf
    • http://januxalak.rf.gd/gta_5_steam_api_64_dll.pdf
    • https://s3.amazonaws.com/kisimujuk/68726255796.pdf
    • https://s3.amazonaws.com/wenobagupexekap/jevejamovukipelumis.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010765.bin
88fb36986fb2fe56d2b6a1e0764ea80731ed736c1e7849eb92a932169886f1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 4640 bytes
font_01_sfnt_off0001173d.bin
6e5a08127941f4e3bbfa709af23abb62b5a5ad8b3624be61dff9238d69016af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1173D 10896 bytes
font_02_sfnt_off00013c8c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8C 4324 bytes

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