Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b7e51fb4ce31d0…

MALICIOUS

PDF

70.3 KB Created: 2021-03-05 07:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9e0511c53b0689110e2736f4889e5395 SHA-1: 7d5f2fe0aeae3549efa3e7b078f5144f12a841ce SHA-256: e8b7e51fb4ce31d079802a2c31abfb3add45e8937eaf0bec0a6f5ef7750abb7f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute phishing content or malware. The embedded URLs point to suspicious domains, further supporting the phishing or malware distribution attack pattern. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=dr+seuss+books+free+online+reading PDF link annotation
    • https://cdn.sqhk.co/wemowubire/aiiijzx/1029094716.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/p9eiiih/snapchat_support_contact_number.pdfIn PDF document text
    • https://cdn.sqhk.co/rurufimibiwe/iijgvgi/canon_camera_won_t_connect_to_computer_wifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445735/normal_5fe920b1198f9.pdfIn PDF document text
    • http://cz-nitrof.website/non_mendelian_genetics_worksheete96lx.pdfIn PDF document text
    • http://demask.space/death_note_meglio_manga_o_anime17t6b.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/ieiazjc/kijujosuwuvuwetebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_603d194c1c53a.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/ds4FOhc/how_to_breed_dragons_with_4_elements_dragonvale.pdfIn PDF document text
    • http://prizinsta365.website/apsrtc_pf_loan_application_formrfhq0.pdfIn PDF document text
    • https://cdn.sqhk.co/xebosulog/wjdicW4/rexroth_hydraulic_calculations.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/fhbicia/buxat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5ff287121b133.pdfIn PDF document text
    • http://elinekici.online/98289943694yst3x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waruzav.epizy.com/56876172120.pdfIn PDF document text
    • http://viladanus.epizy.com/annexure_c_form_sassa.pdfIn PDF document text
    • http://wisunomimat.epizy.com/fedevonipud.pdfIn PDF document text
    • http://niruxivu.epizy.com/cellule_caliciforme_de_l_intestin.pdfIn PDF document text
    • http://rifoxofome.rf.gd/sherlock_holmes_2009_movie_in_telugu.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_off0000d481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD481 5276 bytes
SHA-256: 7953df729e4a3c579041676933476c173154886cef0c296e6ffded67c9874e1f
font_01_sfnt_off0000e68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68C 10504 bytes
SHA-256: a9264a863bf3a85e0bb2c3856b0ca83fba22c8430ec5fd7fa5b8df473f26ac78

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