Malicious PDF — malware analysis report

Static analysis result for SHA-256 665dba2cf7d210bf…

MALICIOUS

PDF

79.1 KB Created: 2021-03-16 22:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 27a2b76be06dd4aed564b72a4662d551 SHA-1: 959cc5731bbba01ddc842e3ae0e836002cc7b049 SHA-256: 665dba2cf7d210bffc7af96dc7b1c62b3feddd2f541ea059adaa3e51cf5e3644
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 0.9982

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://dafemum.ru/wix?keyword=game+sro+moi+ra PDF link annotation
    • https://cdn.sqhk.co/gefisodir/zpChdic/suffix_less_worksheets_grade_3.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/fieggKc/53195585541.pdfIn PDF document text
    • https://cdn.sqhk.co/jixavome/djjibR2/homeroom_oakland_mac_and_cheese_recipe.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/gcAjhif/49960933819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423443/normal_5fdd9c26ac402.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/zexavixomivasusajax.pdfIn PDF document text
    • http://siparuzavikowut.iblogger.org/xenajedaze.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/c1je4sY/emergency_contact_form_for_students.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/71037905988.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/unix_linux_administration_handbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456165/normal_5fc87fabcd556.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/kidofazawolujatikiton.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hdhcXYV/72892382007.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pobixedele/cardiopatias_congenitas_acianogenas_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/zonajenikurazuvunati.pdfIn PDF document text
    • http://lesofowan.rf.gd/ludovico_einaudi_experience_violin_sheet_music.pdfIn PDF document text
    • http://makowadoka.epizy.com/cfa_level_3_books_free_download_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/wifimo.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/levumidovenomo.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/factoring_quadratics_algebra_2_worksheet.pdfIn PDF document text
    • http://luvetux.myartsonline.com/which_blood_pressure_monitor_is_best_for_home_use.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/captivate_book_summary.pdfIn PDF document text
    • http://pabixezo.rf.gd/can_you_use_google_play_on_amazon_fire_tablet.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_01_sfnt_off0000e157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE157 4432 bytes
SHA-256: b0af9f5ae47f2016ffff65f6d4e37539989d1bf9b22ba8fd77f1b5106fa20451
font_02_sfnt_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 19760 bytes
SHA-256: 46d600bc812be5b2ae79391cb1eb450af1211da1c3f1506af6dc0a071d5594f5
font_03_sfnt_off00011ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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