Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d9f2ec2e60e30b…

MALICIOUS

PDF

78.9 KB Created: 2021-02-15 02:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76e612fd837cb3895a6dea48d7cc823f SHA-1: dae0a020fe5858ddc1ff857e64927579119105de SHA-256: e8d9f2ec2e60e30b17b25f3fd10e2c7978677623d28a2cc473ac5ca83fcb8962
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. One of the primary URLs extracted is https://jacksth.ru/123?utm_term=san+diego+state+finals+schedule+2019, which appears to be a lure. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/123?utm_term=san+diego+state+finals+schedule+2019 PDF link annotation
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/sexezemirevopakiw.pdfIn PDF document text
    • https://zikowajemaje.weebly.com/uploads/1/3/1/6/131607239/4825750.pdfIn PDF document text
    • http://sonuzevemuguke.iblogger.org/android_tv_box_channels_list_malaysia.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/b55b2eb2545d74.pdfIn PDF document text
    • https://cdn.sqhk.co/ramowejub/geha5je/pufajekuxovusoxasubiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/xawuboma/5jDlggJ/kisovubomumivet.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/hidji7T/71322474299.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/lixonebate.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/Egcigjj/jump_over_the_broom_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/ifcgiiH/special_agent_dale_cooper_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jU4ZLuS/kawedaxoxeweka.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/gdgf1ja/anime_avatar_creator_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/SsP2w58/chicken_shack_menu_las_vegas.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/hhgije8/how_to_bleach_tie_dye_sweatpants_and_sweatshirt.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
    • http://zuloxuso.epizy.com/77038661427.pdfIn PDF document text
    • http://tozemuj.rf.gd/action_research_definition.pdfIn PDF document text
    • http://vowukexakajan.rf.gd/hyponatremia_management_european_guidelines.pdfIn PDF document text
    • http://borakenibafet.rf.gd/barclays_ppi_form_address.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5652 bytes
SHA-256: cba09b7fbf1069e1c156d182f114228ed414f6335d1400a339b7ab8a4ac2614f
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 11436 bytes
SHA-256: 5a874166c8cc8c61d0df82e22547d6085745e7e114b3f904ab265c9099db6996
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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