Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e09a8331573a30…

MALICIOUS

PDF

73.2 KB Created: 2021-04-03 19:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ff2409736de231fc2f6bcb98f6c15e8c SHA-1: 68a33ed010740f26389c1e0ccf48c7f18f637072 SHA-256: 55e09a8331573a30b3e94bd363bbab379f7ba906334cc8d1f783399d796e06b8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, indicates the file was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=printable+affirmation+cards+pdf PDF link annotation
    • https://cdn.sqhk.co/tezofugowura/muhaBFD/viticulture_and_enology_degree_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/hgfrzjj/munedexevuravun.pdfIn PDF document text
    • http://bio-ita.fun/sonicwall_tz_205_setup_guideimzrq.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/jauhgib/electricity_meter_number.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380395/normal_602c97561a60a.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/eusicie/non_infectious_diseases_examples.pdfIn PDF document text
    • http://storeeu.info/how_to_use_hans_3dsyzk4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fe92a6973b65.pdfIn PDF document text
    • http://razvivatel.blog/how_to_reset_drum_on_brother_printer_hl-6180dwdspcg.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/p5uuNie/99890923806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379483/normal_6031fa062408b.pdfIn PDF document text
    • http://otomail.business/echo_pb-250ln_fuel_line_diagram7rgbj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366304/normal_5fc5b2db802d6.pdfIn PDF document text
    • http://cookwellbakewell.com/nedipukoleicwcu.pdfIn PDF document text
    • http://espaceabonne.com/how_to_do_walmart_grocery_pickup_survey8brtg.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/cda9dd7b-5bfa-46da-a239-0bebb3b392e8/virustotal_uploader_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264f0ace-1317-4054-99d1-e89ebab05932/emdr_therapy_scripted_protocols.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72391b63-7488-4ca2-813b-d772e5fe3fd3/twilight_1_full_movie_download_in_hindi_dubbed_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2994e7be-dd35-413c-952f-c56e6c740e9e/spanish_dictionary_to_english.pdfIn PDF document text
    • http://rilifufamorupud.epizy.com/abdullah_movie_song.pdfIn PDF document text
    • http://novuzebires.rf.gd/comment_interpreter_un_scanner_abdominal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/065d69da-4ef6-4ac1-9592-fa4942195bc5/59238034606.pdfIn PDF document text
    • http://zagebixomibolo.rf.gd/wosexuxo.pdfIn PDF document text
    • http://rozepof.rf.gd/capstone_project_civil_engineering.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 5444 bytes
SHA-256: 4e15273cfa9615045f598bd9769a06cdfd74d3698c2c8cccf36aaf7c9cf41f26
font_01_sfnt_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 10596 bytes
SHA-256: 0fd808ed4d31090e5bb0252976d1e4bf21a46e75a90e8623d86a9575b36c5289

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