Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c013f863a8f0a62…

MALICIOUS

PDF

82.4 KB Created: 2021-03-25 03:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93821a4a66701cf2ac26b47af35bd178 SHA-1: dc2c80f49fc312881adf7d0ce0881b2d41adbb4a SHA-256: 4c013f863a8f0a6283878775efdcd349b1dca304bb1bd684be1db91cf10b172f
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to 'https://zajinet.ru/wix?keyword=connectify+me+apk', which is likely a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=connectify+me+apk
    • https://cdn.sqhk.co/zafilivopupu/ghOjdgc/restrictive_lung_disease.pdf
    • https://cdn.sqhk.co/repipedifavi/94SwGs8/klondike_adventures_wikipedia.pdf
    • https://cdn.sqhk.co/vekuperik/iO7jbjb/best_contemporary_christian_music_album_2020.pdf
    • https://cdn.sqhk.co/fagaluwozez/zd7jchb/dark_raider_costume.pdf
    • https://cdn.sqhk.co/fepexeguma/H3mggie/15919645074.pdf
    • https://cdn.sqhk.co/pulazapusaw/OicOiaQ/78602728441.pdf
    • http://vewigufirenaw.22web.org/reproduccion_del_caballito_de_mar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6eccb2b2-539b-4aaa-966c-327b15587559/heywood_j_2018_internal_combustion_engine_fundamentals_john_b.heywood_download.pdf
    • https://uploads.strikinglycdn.com/files/1757e749-32dc-4198-bf16-95d8045482d5/livro_metforas_da_vida_cotidiana_download.pdf
    • http://bumupumelagel.epizy.com/kiwetapasebesager.pdf
    • https://uploads.strikinglycdn.com/files/5cb3e957-8eae-44b1-b829-25a0a7335015/past_perfect_and_past_perfect_continuous_perfect_english_grammar.pdf
    • https://uploads.strikinglycdn.com/files/d5ed06b7-4572-40f5-a141-aa09d23b92fe/the_rules_of_the_game_short_story_summary.pdf
    • https://uploads.strikinglycdn.com/files/ff7c2e26-5929-4fb5-b962-e301bfae58ec/99863330538.pdf
    • https://uploads.strikinglycdn.com/files/d2e98feb-ffe2-498f-b74a-d78eaaed3d75/97687177435.pdf
    • https://uploads.strikinglycdn.com/files/da2bb827-e05d-4b96-baef-bd5e3b357f2f/how_many_calories_are_there_in_wendys_large_chili.pdf
    • https://uploads.strikinglycdn.com/files/88c65f44-ebb5-45a5-8083-36898c73447e/algebra_lineal_para_que_sirve.pdf
    • https://uploads.strikinglycdn.com/files/ce13f268-5f80-4ca3-a22f-ee6f2133be23/betujugoluwig.pdf
    • https://uploads.strikinglycdn.com/files/bb726086-e694-499f-8080-75e4d7b71fbd/difference_between_food_web_and_food_chain.pdf
    • https://uploads.strikinglycdn.com/files/5779d67a-b641-4243-994f-ec76b36c9bf3/lupelafixesebisupol.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea3.bin
a781546498ce2e018fab18abd4fa11b08eafa402f0d8dadb68ef2eebfd2edc15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 4928 bytes
font_01_sfnt_off0000ff6b.bin
474317cfb30262476b31a4d7d6009c8c208217475c5128cdb5d25f7cea203a84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 10784 bytes
font_02_sfnt_off00012490.bin
2fbd06328f3ff75cfb723e45c11bbcee03f944bf137e238107822000fe26392d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 16292 bytes

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