Malicious PDF — malware analysis report

Static analysis result for SHA-256 c986b5d73ba81604…

MALICIOUS

PDF

70.9 KB Created: 2021-02-09 19:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 81f8a086cda23fcd78b3e597c949d917 SHA-1: d1f6f4dae7589766db4bbaf0c97d823fe083c3f9 SHA-256: c986b5d73ba8160432a7b8fe461eabb25917e5b3a07b55a8f2a6a6eacb4690b8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, some of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download content, likely a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wb?keyword=java%20121%2064%20bit PDF link annotation
    • https://cdn.sqhk.co/xijogedobu/hj7oezJ/hoop_messenger_apk_mirror.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzabajixiw/H0J6jb6/truck_accessories_for_towing.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/UCw6IC8/acorns_invest_spare_change.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/hgQdHPv/juxebolavu.pdfIn PDF document text
    • http://chestlune.online/mivalumuruzuwodezagzeqlr.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/jbcjdBh/cell_world_and_tobacco.pdfIn PDF document text
    • http://rufafepikawaj.22web.org/unit_3_uniform_acceleration_worksheet_2_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kopenanum/idgejfb/lugobu.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/ghijjeQ/mother_earth_foods_parkersburg_west_virginia.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/yp4hdDA/best_game_creation_software_for_pc.pdfIn PDF document text
    • http://melukutirigap.22web.org/7064444769.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotawof.rf.gd/bcd_to_seven_segment_decoder.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/metal_work_pneumatic_cylinder_catalogue.pdfIn PDF document text
    • http://sepimenixinu.epizy.com/contorts_the_face_crossword_answer.pdfIn PDF document text
    • http://vezoxonu.epizy.com/59538080910.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_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 4988 bytes
SHA-256: 1be35c73c77b78cf42750912c08909d12655f2012610a60a6e5262e0b87329e8
font_01_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 10240 bytes
SHA-256: 89d47d738ae6ef0054f80526ff296c0baa2b9ec6d5c55fadc28688f746d671dc

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