Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f12220959651ec…

MALICIOUS

PDF

80.6 KB Created: 2021-03-08 23:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b6bb7ecf8e8c723febfe4dd206f9def1 SHA-1: bd3dd87f5263744e7c6829d9e63c9beed5598345 SHA-256: 99f12220959651ecd20f78cfc00246b13537f52f3b1439e7271f01881fc916ce
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on directing users to external sites that appear to be link farms or phishing lures. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for a large number of links, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/award?keyword=arduino+gsm+shield+projects+pdf PDF link annotation
    • https://cdn.sqhk.co/zujadibarise/ibT2Gge/21416000526.pdfIn PDF document text
    • http://hamlikjorettoop.ru/gravity_falls_saw_game_guidehqo9j.pdfIn PDF document text
    • http://lnstagramverifiedbadgeservice.com/world_championship_darts_2019_flashscoreavu6y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394062/normal_5feee18191647.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/hijaiew/exploration_lite_2020_apk.pdfIn PDF document text
    • http://dressnbuy.com/registration_form_template_wordpress2zq21.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/dijdjex/photolithography_book.pdfIn PDF document text
    • http://the-english-temple.com/jawbone_big_jambox_replacement_speakerwn2i6.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/5njc37w/mi_pattern_lock_screen_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_6027afa8e3e6b.pdfIn PDF document text
    • http://gafabotipunofu.mywebcommunity.org/waste_to_wealth_ideas.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/letijapulo.pdfIn PDF document text
    • https://cdn.sqhk.co/tuminageka/bia3hbn/rugazujopafedokeziresurad.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/48837216445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/arris_cm820_cable_modem_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313d728a-c777-491e-b511-316a112bbdbd/mcsa_official_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd7e96a-0d3b-42ef-b41f-841b454ccd3e/malaysia_lonely_planet.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/zesozabonebimibe.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/dd_5e_combat_actions_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/tiguwemorujogamakidisi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA15 5424 bytes
SHA-256: 43a6a355732a0fd7ddfb8c1226f10c764aa4de4ed1011e0aabba0b26a8e59da5
font_01_sfnt_off0000fc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC70 10344 bytes
SHA-256: 0c9f885792753602b056d62174bac2f7892c441fbd795b4e9d56d96831c904be
font_02_sfnt_off00012028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12028 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d

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