Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e60384182be3c05…

MALICIOUS

PDF

75.1 KB Created: 2021-04-28 23:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 06d2003353cebf0705003605cd7cc925 SHA-1: c55c2b318d638f300ffcb7067e2267fa1feea52a SHA-256: 1e60384182be3c051f435864b33154f781275ae97f48474b86f3e8f897d0a8cd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malware. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'learn python free codecademy' and 'wkhtmltopdf', likely serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=learn+python+free+codecademy PDF link annotation
    • https://cdn.sqhk.co/xegunorasu/jhyhbvr/vejidaj.pdfIn PDF document text
    • http://medway24.com/fikigukibuxrbsz.pdfIn PDF document text
    • http://datab.vip/commando_game_free_for_android_mobile27416.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fd3c7ee370fe.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/3234032361.pdfIn PDF document text
    • http://rumepado.mypressonline.com/zajulamil.pdfIn PDF document text
    • http://tapagigozi.medianewsonline.com/spreadsheet_application_in_business.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381291/normal_5fd2a0f605503.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/mamiya_rz67_lens_equivalent.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_60676af3cd37c.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/fgdid9h/pop_music_mix_2019_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rugofufol/ieXiblq/desmos_graphing_piecewise_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/NKgiYie/rowomuzazuzidutereju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_5fda8cebb60a4.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/7937195171.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/nhjv8hd/sexejaxodosikupaxokun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_602154229935d.pdfIn PDF document text
    • http://vanlit.ru/gapuroxoniwkhcu3.pdfIn PDF document text
    • http://dovujaxemedu.mygamesonline.org/74272088251.pdfIn PDF document text
    • http://fastdonwload.space/53743096651lctjr.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/zotugopefevofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA53 5228 bytes
SHA-256: 915a68df35e6946b72876fb7836fa39913b5c9a07011b53e6c9840dbb7e3aad7
font_01_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 10320 bytes
SHA-256: 7657977be55f7d12dc74b6e5296490353280f59a4c5147bfa476e02f30badcdc

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