Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e93e123f0a90fa…

MALICIOUS

PDF

79.6 KB Created: 2021-02-19 12:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fbc9d92d5bdefd41e8434dc3e2324adb SHA-1: 52affad160c29b65f5757559aafc45e2319157ab SHA-256: c0e93e123f0a90fa3993b0458da687e6561ba209610daee08bc5b7d0f252b195
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The sample is a PDF document that contains numerous links, many of which point to disposable domains and are likely part of a link farm. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content encourages the user to install a browser extension or update, a common social-engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://leonvi.ru/wix?keyword=multiplayer+for+minecraft+pe+pro+apk+download PDF link annotation
    • https://cdn.sqhk.co/baxijaxazixi/ifLYIji/duck_life_treasure_hunt_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vifutetax/gjjcUhg/fotawesumusunomaguserol.pdfIn PDF document text
    • http://mavpa.fun/exercice_excel_tableau_crois_dynamiqueotfpx.pdfIn PDF document text
    • https://cdn.sqhk.co/gesafafo/htZcHbG/kogojabolokoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/fNjaibX/gefolewuz.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/IidhgDc/short_horror_stories_in_english_to_read.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/hgdkijh/77654553951.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/eZ4hfhi/quizup_multiplayer_in_counter.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/86429825914ca8kn.pdfIn PDF document text
    • http://avit0.pro/double_gun_shoulder_holster_for_saleb5525.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/mPheKEG/swordsman_of_landstar_yugipedia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://boxulinizisa.epizy.com/axa_ppp_dental_insurance_claim_form.pdfIn PDF document text
    • http://jusakurufawotol.rf.gd/lakobur.pdfIn PDF document text
    • http://tapopopabe.rf.gd/filutizizavutadisogufufo.pdfIn PDF document text
    • http://sedobuxekazadi.rf.gd/baby_boy_names_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/cbt_for_ocd_intrusive_thoughts_worksheets.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/animal_classification_worksheet_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 5384 bytes
SHA-256: 2460c6aa89edbb45b748a0df01bf7b17895debd5d2bda2247509500b859e5a57
font_01_sfnt_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 2548 bytes
SHA-256: 59dbbb31d938716b88f8ac453f39786f75abb3a925ef2ecfc90b561a59aa1bd9
font_02_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10772 bytes
SHA-256: d3b9861269671a85800e09b21841284f0db7b7fbfd23511edcc3cf81121ce3c8
font_03_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 16628 bytes
SHA-256: 2cf717da4e649f79a03686c86154eadbd82f4984a7221b2a49e1f3fee01bf287

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