Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6091ef8b7e7e96f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 14:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0020231b3e4f3d0668dd4a14b494e62a SHA-1: a3cc12b089f89d3a4c973b71cc06f4cad5110c13 SHA-256: f6091ef8b7e7e96f4072d3af6b69f37f4fd6c48e3b9bc2eb80833dfa8639a431
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 5

  • 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 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://coretry.ru/uplcv?utm_term=yle+movers+worksheets+pdf PDF link annotation
    • https://fleschimmo.lu/userfiles/files/xajubabuwojugib.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/30396443791.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/kedizofijuvaditokewu.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/35654984234.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/65172668605.pdfIn PDF document text
    • http://patroha.hu/file/96076044021.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/d15fgt2ldbujpi00kt0h7nofi6/muxedalemuj.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/28936844548.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/vovulijakurerunuzabu.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/67265224923.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/71281226204.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/86588508561.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/69595498157.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/78836069169.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/buzumuwuvolatesomurotoxon.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/julolowaliniw.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/91016014194.pdfIn PDF document text
    • http://elsped.hu/files/file/61670790654.pdfIn PDF document text
    • https://mangallagn.com/images/file/73835101578.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/18287377240.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/novobigemetiriratif.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/sivifuxexapajumogaruwudo.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/busiramitabijagimute.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC640 10632 bytes
SHA-256: 44324694204bff7fd32f10a5fe7fb43b6e466a13eb3359754ebe83b7579b3b76
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 21384 bytes
SHA-256: 7357c0efe63ee6ab11c14883120b59d0e938429f2c598b9454127ccf119e0820
font_02_sfnt_off000113d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 16548 bytes
SHA-256: f8ebe3a2cc34ddd214749ce7e11edd85d226a6dd7ff1bd199c6a63b764010e8e
font_03_sfnt_off00012b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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