Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13b21885146507b…

MALICIOUS

PDF

89.1 KB Created: 2021-04-08 22:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9426cd77a61a62e5833271c9dba5ec85 SHA-1: 10bffa4f950aaeb2647c55689db93c3b3a2e244a SHA-256: e13b21885146507bd6345a2a3950b6df9f2bca8abb40ceca8d0771c99e56431d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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 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.
  • 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/strik?utm_term=the+dark+tower+series+book+1 PDF link annotation
    • http://copyright-notice-ig.com/cmo_construir_una_gra_prtico_de_m5vwlq.pdfIn PDF document text
    • https://katifakemu.weebly.com/uploads/1/3/1/3/131381151/7106218.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://fortuneo-enligne.com/brother_hl-3170cdw_service_manualt7s8v.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/how_to_connect_presonus_audiobox_usb_96_to_ipad.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://teniroge.weebly.com/uploads/1/3/4/6/134693228/1928084.pdfIn PDF document text
    • https://gidaletibom.weebly.com/uploads/1/3/4/8/134881461/03f8d30b14c2c.pdfIn PDF document text
    • http://setopin.mypressonline.com/williams_a_critique_of_utilitarianism.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/e89df67d-041e-4284-894c-b7589d63baae/beats_studio_3_black_friday_deals.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/surface_area_of_a_rectangular_solid_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/free_algebraic_expression_worksheets-_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/28652748014.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/check_spreadsheet_for_macros.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/jasmine_tamil_movie_2019_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528f4c24-0655-4a0e-b8cf-d655a7c24fbb/debupuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/jeevan_lakshya_premium_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/94051928178.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/ansible_ini_file_format.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_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 5176 bytes
SHA-256: 6d4b89393805aec6b53a28cbe8b7df32c530e874ba27f75f88239143dc6ad953
font_01_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 13388 bytes
SHA-256: 5a57934c1b09e92cb6976fb6fc4960d4b912e22fead43edcda751849738d5aca

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