Malicious PDF — malware analysis report

Static analysis result for SHA-256 08267bf9be37dd73…

MALICIOUS

PDF

88.0 KB Created: 2021-05-08 17:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ef3c3103aa7d20f8af29dc9c20854df1 SHA-1: c6b1fc7ea42fae3c3fc4a66f56424e07016071e3 SHA-256: 08267bf9be37dd735524b6a923a9d11b4b65d4f8fb07893bb73dabb2bc2ec93d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or redirectors, suggesting an attempt to distribute malware or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable domains, further supporting a 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://baarspo.ru/strik?utm_term=fichas+de+lectoescritura+para+primer+grado+pdf PDF link annotation
    • https://cdn.sqhk.co/pikukafil/2Ewjaje/wirosanefonif.pdfIn PDF document text
    • http://dimopun.mywebcommunity.org/89830556959.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/zOhb2ji/jackson_michigan_police_scanner_frequencies.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/36625229390.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447640/normal_5fffac69960e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378848/normal_5fec235b7ca5f.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/rjFgegd/surapepivam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_602ad031036d9.pdfIn PDF document text
    • https://cdn.sqhk.co/jopubelo/iNpXihy/checkers_restaurant_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvodix.myartsonline.com/bojodudafujarogunema.pdfIn PDF document text
    • http://xudonujedetatik.epizy.com/revune.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/sync_outlook_calendar_with_my_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/castle_of_otranto_film_1977.pdfIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_76ce8955dc4b469cb7469ad847e75aff.pdf?index=trueIn PDF document text
    • http://keximidurowu.rf.gd/workbook_worksheet_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/79276632212.pdfIn PDF document text
    • http://repafow.epizy.com/bubble_sheet_reader.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_7e3cf3ce0262414180a952448448700e.pdf?index=trueIn PDF document text
    • https://229c0a76-8cd2-4a6d-ad64-a548a1436bbb.filesusr.com/ugd/f9ed01_e1096dcc76404dffb69ecd3ebabcd831.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_c17a4d0ae0d243738265de3f44717564.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_f306e257dfb6453eb3baf3944e03d602.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/bozitasegojatedigewigivel.pdfIn PDF document text
    • http://buwanizun.epizy.com/79522078013.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 5524 bytes
SHA-256: f3b40338540b24d32e2b2453f92427159a33780bd7a4f36efbfb4f71b0a8add0
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 13476 bytes
SHA-256: f959f3201b71d2ef2c285046d0f955ce9a8bfdc712afa171d33ed3001ee97004
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 17260 bytes
SHA-256: 47f3a770fd8e7943a8776212f1d169aacc47f76ffeea1cc8e6c134f4beedcf33