Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0f0617a702e3d3…

MALICIOUS

PDF

165.6 KB Created: 2021-03-10 03:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 879ebd1a453523b3ff8ae2f66eb5bb01 SHA-1: 2c817455626e24928296500f419e830f165d11a4 SHA-256: 9f0f0617a702e3d3ac249b508c105b965fc21d186d72c82fcd14cfff552a363d
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are associated with link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to DNA, likely a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9702

Heuristics 4

  • 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
  • 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/strik?utm_term=how+many+strands+of+dna+are+in+a+cell
    • http://gunofixe.medianewsonline.com/6150471889.pdf
    • http://digosige.mywebcommunity.org/65822813438.pdf
    • http://kofodotig.sportsontheweb.net/tozawolowuta.pdf
    • http://mezajozugabaso.getenjoyment.net/kebib.pdf
    • http://julivojurukumu.sportsontheweb.net/vishnu_sahasranama_list.pdf
    • http://mubinazo.22web.org/aashiqui_2_movie_video_songs_free.pdf
    • http://nositadox.mypressonline.com/21220323085.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_b0a468c9c37f4b15b63a8e4d4dd79260.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_da2d49aa46364246a5f42a51208fb479.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_4241edd6eef14b578da8b31a7d2edc8f.pdf?index=true
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_640737a230c646d48e91af7e728a78c5.pdf?index=true
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_baaaf691a2f24e82a9e61b73cd63182d.pdf?index=true
    • https://s3.amazonaws.com/rumezo/octavia_butler_bloodchild_audiobook.pdf
    • http://kuwijiti.myartsonline.com/what_is_the_importance_of_cleavage_in_development.pdf
    • https://s3.amazonaws.com/rakabexozu/11195723737.pdf
    • http://xozokol.rf.gd/best_stroller_frame_for_chicco_keyfit_30.pdf
    • http://wugujub.onlinewebshop.net/what_is_lean_toyota_production_system.pdf
    • https://s3.amazonaws.com/kodipopujufipig/arrest_warrant_case_2002_icj_reports_3.pdf
    • http://popofisofol.myartsonline.com/3691138411.pdf
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_81d365a6925c4118a1356a23570f6e5b.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002629e.bin
c9b5a9f2d18e242a2f1a6aa0e1199f76d4c1b8ec53fa18df494fd8aa934faecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2629E 5324 bytes

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