Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b85f2562fe4a63…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 21:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d05ee544540c262dc49fbec7ae6e72bb SHA-1: df12cb1ea7de8cf8c404057d973b1ac8c1f04e6c SHA-256: 77b85f2562fe4a63cd3d4b592289a61a054e316352f95e54a080d29d3e47cba5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=bollywood+movies++in+mkv+file PDF link annotation
    • http://christmas-gift.ru/how_to_connect_my_dish_dvr_to_wifi5oagh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450896/normal_600148f8d8d2e.pdfIn PDF document text
    • http://prostochillforum.fun/fozoxorapepaxetekoneridiavica.pdfIn PDF document text
    • http://sale50.pro/lubaxabizuv2xr0q.pdfIn PDF document text
    • http://heartcenteredequestrian.com/sozejegojulezajoregibomfrt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ff521bee769f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465908/normal_5fd0e473528b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460072/normal_60242a5888d7d.pdfIn PDF document text
    • http://vas-rem.ru/numojekarabadavamuwo9dxbp.pdfIn PDF document text
    • http://neo-tp.ru/likefinusuzaetw7j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478134/normal_6009452697643.pdfIn PDF document text
    • http://13millions-warzone.store/yashoda_ka_nandlala_mp3_song_downloanmkc2.pdfIn PDF document text
    • http://iglivesupportteam.com/parallel_circuits_worksheetkj0ig.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/2975edb5-08af-4625-9483-de51c1bc1993/31513889679.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/98801681047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adc70352-d6a0-4acc-b16c-2eb6e0ccfd95/ganamrutha_bodhini_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/vowedalojomafupemisopevev.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/20621829315.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/gufadobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b11ef0-96ef-4e05-9629-59c89854d132/zero_conditional_sentences_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/61324083901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffc6086-7659-4e79-8c3f-76543dc17fe9/why_does_the_pendulum_on_my_cuckoo_clock_keep_stopping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f4ff0b-c9c2-446c-a34b-fb7fa5bf3eb0/volume_of_a_sphere_equation.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_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 5112 bytes
SHA-256: 9aebba3349cda4df095525383992bbdc53aed971e597d445239167fbbb624ec5
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10972 bytes
SHA-256: 272961b643b8aac638c6dcc731f24785235d8f2f071873d40a0f1dca3c07382b

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