Malicious PDF — malware analysis report

Static analysis result for SHA-256 611fad7c1207bedf…

MALICIOUS

PDF

78.5 KB Created: 2021-04-12 10:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0e767a6a56084f08838eb48ff444312f SHA-1: 27d19769b595557b43456052c00f5e0ee248fa3e SHA-256: 611fad7c1207bedf7939c4015507421cc944aa2a3af500449feeec128168d9e9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an embedded URI pointing to a suspicious domain. The PDF document body, though heavily obfuscated, suggests a lure related to 'economic systems', which is likely a pretext to drive users to the external URL. No scripts were extracted, but the presence of external links and the overall detection profile strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=tipos+de+sistemas+economicos+pdf PDF link annotation
    • https://cdn.sqhk.co/fevubito/5msjahf/93370639905.pdfIn PDF document text
    • https://cdn.sqhk.co/rajexizeba/iegihfF/newspaper_liverpool_football_club.pdfIn PDF document text
    • http://unonatur.space/584298681950o6f5.pdfIn PDF document text
    • http://morpeoplelife.ru/vanojawugedaxutexelugipt0.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/7Ayibig/app_screen_recording_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372085/normal_5fcf4921a40f7.pdfIn PDF document text
    • http://buylettersonline.com/zuxerodexukapxw27w.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/a0gfCdI/jitufopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_602842b9220b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5ff1df302f5ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bffc21e-ecec-432f-a6bf-54e077450043/katalu.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/51817862965.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/admit_card_dsssb_prt_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4a7197-f4a5-43eb-a35a-b43b51e9ace6/sylvia_plath_daddy_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7149827f-689e-473b-90f4-36d8a2534f0f/how_to_use_removable_matte_vinyl_cricut.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/kepidumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0040438-d32a-42cb-8522-e1530645698f/gameshark_cheats_for_pokemon_fire_red.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/63239185821.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/cisco_ix5000_troubleshooting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/formal_makeup_blonde_hair_blue_eyes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/595a361c-ab83-4823-8e96-6f4c453ffee6/84080398591.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/34149038543.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BC 5120 bytes
SHA-256: 5d4f1229f6953ada40aafa30dd8382e298f85ac753cb7ca3ba41038157eed449
font_01_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 11508 bytes
SHA-256: 61634fdf6d625e36943949053e01f0996e63507023b39c79b1f8ab07dd4967cf

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