Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd2078490c02c19…

MALICIOUS

PDF

68.6 KB Created: 2021-04-05 15:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fc99503b461f71c67a8d97ae6596d84 SHA-1: e2bbdfb8b920dbf870217a6441eca37514066205 SHA-256: bdd2078490c02c1956ea856a50cd4b70684f1a52beb22272afd2b8190430f70e
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one prominent link pointing to 'vilenefex.ru', suggesting a phishing or content-farming attack. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=ecological+relationship+worksheet
    • https://cdn.sqhk.co/rufonova/bxUchjo/house_party_game_leah_guide.pdf
    • http://nutesane.iblogger.org/77954912321.pdf
    • https://cdn.sqhk.co/nukusigemug/q9jbpVT/lighthouse_of_alexandria_location.pdf
    • https://cdn.sqhk.co/xesozugis/ijihijc/usar_movistar_plus_en_otra_casa.pdf
    • https://cdn.sqhk.co/pifixijowoka/3G86Gbk/moto_traffic_race_2_download_for_pc.pdf
    • https://cdn.sqhk.co/jotepomi/v9iNhgY/xugikiguma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wafapajof.epizy.com/current_aha_antibiotic_prophylaxis_guidelines.pdf
    • https://s3.amazonaws.com/sagotomagin/how_to_read_someones_mbti.pdf
    • https://s3.amazonaws.com/gofiguj/7_day_alkaline_meal_plan.pdf
    • https://s3.amazonaws.com/mixanaz/how_to_put_money_on_prepaid_visa_card.pdf
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_ce5cdc0208774bf09993c4c4b98bc664.pdf?index=true
    • https://s3.amazonaws.com/divelatoxa/second_law_of_thermodynamics_questions.pdf
    • http://xapakiz.rf.gd/22672991729.pdf
    • http://komivarutu.epizy.com/bravos_xl_dryer_wont_turn_on.pdf
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_22576c9436224c5aa19b34dc05889bed.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/molejaxawaduxezap.pdf
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_76fe357365604c93a057b737311f7faf.pdf?index=true
    • https://s3.amazonaws.com/dagasopones/annex_14_icao.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_c4bc35820cbf4f8cb3aa105394d35d9a.pdf?index=true
    • https://s3.amazonaws.com/xufaxoferugod/60060291661.pdf
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_5932d750626c402c9e7cb2ad7b897754.pdf?index=true
    • https://s3.amazonaws.com/rafiralexezol/questions_and_answers_for_pip_assessment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfff.bin
9b1a490c46f6b2db6db70c204becc25286fa13d8f1076e27fc5ac8755bc26881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFF 5308 bytes
font_01_sfnt_off0000e222.bin
8b8d827bba3be9fff1e1c295141866d7a74cac89a9753f1072e23ebfe737a18f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 10072 bytes

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