Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21a5848fb19df59…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 14:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b8f9014820b7c1d4bb9a43a6398f744b SHA-1: abaffe9ee4b8bc179a0197d75b85a3235a82cb4b SHA-256: b21a5848fb19df59ad07f49572469281b9621b9c04f22b5968f218f34c038282
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/123?utm_term=iosh+risk+assessment+form+template PDF link annotation
    • https://cdn.sqhk.co/lopumilekana/tutjeih/90326177979.pdfIn PDF document text
    • http://mexicotop.xyz/did_cannonballs_explode_in_the_civil_wariufzy.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/3ihjeAg/toca_hair_salon_2___ios.pdfIn PDF document text
    • http://findattime.com/53456571284qiwtg.pdfIn PDF document text
    • http://agent-ritual495.online/ball_gown_long_sleeve_formal_dresseszbjg4.pdfIn PDF document text
    • http://normal-id.com/37815114453x0cn7.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/43744580706.pdfIn PDF document text
    • http://proba7.xyz/zobawanudizozofa4z1mw.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/sapojeguvedokopox.pdfIn PDF document text
    • http://slimerecipe.org/18365359487gffnn.pdfIn PDF document text
    • http://vevufilusik.scienceontheweb.net/merittrac_aptitude_questions_with_answers.pdfIn PDF document text
    • http://tavegumata.sportsontheweb.net/pdf_auditoria_fiscal.pdfIn PDF document text
    • http://apparentlyopt.com/93824527612y1z7c.pdfIn PDF document text
    • https://cdn.sqhk.co/sipebesoxu/gjpcJjg/tozogivubimafoduvoge.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/open_file_browser_using_php.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/bjdfkjb/67964392028.pdfIn PDF document text
    • http://francobusiness.com/david_deangelo_double_your_dating_free_downloadktief.pdfIn PDF document text
    • http://persequenteamsohbet.com/ipad_mini_5th_generation_256gbhb072.pdfIn PDF document text
    • http://5coupons.info/61458190752gih71.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/ghiiigc/42114213750.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zejagal.rf.gd/lorovufiwivigezudisoduliv.pdfIn PDF document text
    • http://komujawabajufob.rf.gd/dokaxe.pdfIn PDF document text
    • http://xibaruj.rf.gd/nikon_prostaff_rimfire_with_bdc_reticle_3-9x40mm_review.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5140 bytes
SHA-256: 82fb3e82a9191ff3bf2f41a491ef83116da0ef1956da15aefd30e90fef019b6f
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 12044 bytes
SHA-256: 37fbb7f82a4893315da44091ce7db79225590236af1a3c6849a04f1c28d7e0e0

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