Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a04c0031176abd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-12 01:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 351a0e743fd5f6249984308b061a2637 SHA-1: 077e375c86b1a8981db3d050c26c3057c9284a27 SHA-256: 33a04c0031176abd0b2e19f9f7c4860a2660f275786425ec3b05100309f26e6e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to call a phone number, consistent with callback phishing or tech support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=margin+call+pelicula+completa+espa%C3%B1ol PDF link annotation
    • https://promaxsuspension.com/csmimage/file/bumanoketapowolojadetud.pdfIn PDF document text
    • http://abwrva.com/uploads/files/xujamed.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/90680842796.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/17695433653.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/89302899377.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210906094631.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/getatodiwazojejeda.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d232bde31a---juvulovixaz.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/xasati.pdfIn PDF document text
    • http://kalikraft.com/images/file/ralejafilepate.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/gikitinogepekolefo.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/nejiwatimukiget.pdfIn PDF document text
    • http://jinyezi.cn/upload/17740913088.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/14324261177.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1612f474536e4e---22175644241.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/1333207109.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/zukifu.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/22249604051.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/23061075330.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/vagozugisunudojelukabo.pdfIn PDF document text
    • http://telektrans.hu/editor_up/74019234173.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/jorov.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/65586262478.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109111701192169.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/58369670586.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_off0000e29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 11016 bytes
SHA-256: 061ceea60bcd9d298cfce8d510101f60ea312d2987f5e171de974e6d977b193e
font_01_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 19356 bytes
SHA-256: 2d1e8e6c2eda470d2f99c314694ccf7ce6f051884da5603c38203083ac647f76
font_02_sfnt_off00012e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1