Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b52a9b0d666ecf2…

MALICIOUS

PDF

143.8 KB Created: 2021-03-17 07:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e1c1cb264bbc96bfc26fec19dc5e629a SHA-1: 1054f13cf3d3f111ef78d6e5584da570b2ec631c SHA-256: 9b52a9b0d666ecf2ba565d8c559735033f202694b79937383a873680d5fb339e
126 Risk Score

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 0.9994

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://crophysi.ru/award?keyword=fernando+pessoa+books+pdf PDF link annotation
    • https://cdn.sqhk.co/vomawoko/hgzKygb/bombay_cat_breed_facts.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/cwhfhj8/hidden_sms_forwarding_apps_android.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/iijgjgp/sirapawozageduxasuvur.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/bubba_gump_shrimp_menu.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/eureka_vacuum_not_spinning.pdfIn PDF document text
    • http://pestore.pro/952844476687bt1o.pdfIn PDF document text
    • http://tafasizogir.22web.org/partnership_and_company_law.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/accounting_theory_research_regulation_and_accounting_practice.pdfIn PDF document text
    • http://nulatapukedu.scienceontheweb.net/56346075686.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/jjiZhiy/70546184524.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/gthgWih/bavurepapawefedaxojut.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/tumupimazugapelesobaraj.pdfIn PDF document text
    • http://onenature.space/looking_billiards_city_mod_apk_android_13aye1.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/2758c380-adbf-4d8d-a726-838e93635bc8/70561691777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb558eb-ea85-426a-9abd-000ea92380bb/guitar_fret_notes_chart.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/what_size_suitcase_is_good_for_carry_on.pdfIn PDF document text
    • http://baritobaseben.epizy.com/calentador_de_agua_solar_casero_con_botellas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/260a7f26-427a-4e39-b499-c2c59f735f01/genie_pro_88_learn_button_location.pdfIn PDF document text
    • http://nevabaza.atwebpages.com/fisomepaxogi.pdfIn PDF document text
    • http://wopojofa.atwebpages.com/convert_to_ms_word_document_online.pdfIn PDF document text
    • http://kubusefot.epizy.com/mathematics_for_economics_and_business_free.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_off0001de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE5F 5164 bytes
SHA-256: 98dd13bb303368a71c7937416c711f6dcec78e3d337c96639ffedf4488323fa3
font_01_sfnt_off0001eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFF7 14728 bytes
SHA-256: aaeddcc3ecc5d650400f2525639332ecd4515a36e8c75ae74208f2d7d798625a
font_02_sfnt_off00021c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C19 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90