Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6735cc106794b2b…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 180ece62dae0f2e74367e02a3a225d53 SHA-1: 6ac514d79285fccf2cd2f0ebf99b067ba819f3c1 SHA-256: f6735cc106794b2b47670e88b25879f5b4765de592fb8f81080cf66c040e4e5e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggests it's part of a link farm designed to distribute malware or facilitate phishing. The 'SE_CALLBACK_LURE' heuristic further indicates a potential phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=download+game+pubg+lite+versi+terbaru PDF link annotation
    • https://gadesign52.com/uploads/files/202109091113202958.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/77203794483.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/5245786482.pdfIn PDF document text
    • http://retailcop.ca/files/wovinikoxapopem.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210914172114.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/buvekarekozagebamigo.pdfIn PDF document text
    • https://e-room.co/userfiles/file/supogafegitiroloxusuxe.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/14591259866.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zunexubumumewajapuzadumet.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/32016205948.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/pixalufipabaten.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/91326648748.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/64440816262.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dca57081e---5943812317.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/fofiratewukofodunezizel.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/furiledinaxedadubu.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1631502118.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/megin.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/34987465767.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090310112359.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/motavedajaviz.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/ripebibulexaxoli.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/36036133139.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 18172 bytes
SHA-256: 05f26906e55b378c2615ce4774e5a9f580c8ff82766657c3ff4802e25beb0f8f
font_02_sfnt_off00010211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10211 11128 bytes
SHA-256: 3850af0a0169c0563900966dbb71e9aac6226ea19c6b16e37eb1a2d5272dcee6