Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce775787c1aa65bb…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 00:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10ed022b2f288ad95c96f54d2d2fd290 SHA-1: 9fadea2b093bb03d7bcb6af59a1b20a591cf6a58 SHA-256: ce775787c1aa65bb0150682a72198487bf9e61d510bb7f762a7ce08ab73048c9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, and the ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure.

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/123?utm_term=pit+bike+track+near+me PDF link annotation
    • http://dvigatel.guru/came_to_believe_online_free2nvs1.pdfIn PDF document text
    • http://tamakar.tech/the_legend_of_futianuxiqz.pdfIn PDF document text
    • https://rizapomon.weebly.com/uploads/1/3/0/7/130739727/9244064.pdfIn PDF document text
    • https://baboxubawuxi.weebly.com/uploads/1/3/4/6/134666135/26c265c922f88.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/b3c2c10f3b6b8.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/international_4300_turbo_actuator.pdfIn PDF document text
    • http://my-favshop.online/decile_report_in_excel5ynb9.pdfIn PDF document text
    • https://madapupe.weebly.com/uploads/1/3/4/6/134667506/1b530d022567.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ghiMVje/dozavajonegenin.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/bRhhPie/throne_of_blood_arrows_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/04ieWij/kasusesaniraxuzejisivep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zomusuxine.rf.gd/gipeg.pdfIn PDF document text
    • http://busagawama.epizy.com/momozivujimadogesuxiji.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/13627058959.pdfIn PDF document text
    • http://dujisuga.epizy.com/flying_car_game_apkmonk.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/96665470693.pdfIn PDF document text
    • http://serivisaruwe.epizy.com/dd_underdark_battle_map.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/reasons_to_stay_alive_matt_haig_quotes.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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 4940 bytes
SHA-256: 41743e0256601626b5aaf1d86ee2c78ac48e3df87fa28d9110dabb31306572be
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10924 bytes
SHA-256: e5baf2d7e2ba9906c800b25cd7c0134f59b68200de10b8c6bc38803998a0dae3

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