Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7a9adbab60a4df…

MALICIOUS

PDF

68.6 KB Created: 2021-03-20 15:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: abdb0fe39c4155f02b05686cdc5be558 SHA-1: 6ec051bcd25c2b3b12f1b8dd2fcd596dde809f5f SHA-256: 5a7a9adbab60a4df4e76f41fa8f5af6b91d61f561cbd85fc40d37a6680b22a47
126 Risk Score

Malware Insights

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

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs, with the primary one being 'https://jumiwimov.ru/aws?utm_term=ap+music+theory+practice+exams'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is structured as a link farm on disposable hosting, suggesting a phishing or spamming campaign. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/aws?utm_term=ap+music+theory+practice+exams PDF link annotation
    • https://cdn.sqhk.co/xeduwukaxusa/hhjcsih/evaluation_matrix_excel_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_6041ae2244100.pdfIn PDF document text
    • http://bovosidifusu.iblogger.org/batman_arkham_origins_ps_vita_trophy_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_602e113381de3.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/YjiOghI/83117689031.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ihgJJck/our_song_tik_tok_remix.pdfIn PDF document text
    • http://bibopasaxuvibu.mypressonline.com/48803387354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_600b6172a8f9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_602e31ecdcd36.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/bhfgdkd/battlefield_capture_the_flag_board_game_crossword_clue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380859/normal_6001845ec5a2f.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/3jj1W2o/tenegunikijis.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/8BghYZj/angry_neighbor_apk_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/senogewuki/DLrePhb/noggin_tiny_planets_intro.pdfIn PDF document text
    • https://cdn.sqhk.co/volotedi/ggeCifG/wokukepo.pdfIn PDF document text
    • http://ditugivovuf.22web.org/trueman_elementary_biology_ebook.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwikiza/Dhj1gib/like_father_like_son_ost.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/eOwjdPF/survival_craft_war_online_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baponexar.epizy.com/engineering_drawing_questions.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/old_school_bagel_cafe_tulsa_yale.pdfIn PDF document text
    • http://nuvezutonotogev.epizy.com/88714048907.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/mental_health_awareness_poster.pdfIn PDF document text
    • http://kerizef.rf.gd/agile_development_download.pdfIn PDF document text
    • http://favukimasinete.rf.gd/inventory_list_template_printable.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_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 5300 bytes
SHA-256: b358e9a640dd5b5d41f5315c4964465c6f2750b5d8d2f293198e799438b5eab5
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10240 bytes
SHA-256: 9e0c14229f2f6aec9974fe82d771091d5aab35e775157d4b8fceeec39b1f4307

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