Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ae6755562a55c5…

MALICIOUS

PDF

78.0 KB Created: 2021-03-12 01:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76ad9c10c38061433274b0a816dabd6c SHA-1: 20c52cb5470219eaf946f4435d198aa91dc60d10 SHA-256: 56ae6755562a55c509e9fec02bde039d5f11f94c3e2d65d4159e2305df9c6441
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, with one prominent URL pointing to 'fokemale.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to a calculator and PDF metadata indicating it 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://fokemale.ru/aws?utm_term=how+to+change+to+radians+on+casio+fx-991ex PDF link annotation
    • http://arthromedro.xyz/jarogoxaduritirezenakibimtan19.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/software_list_for_pc.pdfIn PDF document text
    • http://help-igcopyright.xyz/cloud_foundry_cli_reference_guide3xm27.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/how_can_i_edit_a_file_for_free_online.pdfIn PDF document text
    • http://mebovedu.getenjoyment.net/admiral_heavy_duty_washer_troubleshooting.pdfIn PDF document text
    • http://smeh-mif.space/total_war_warhammer_combined_map5x8xf.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/how_does_the_after_book_series_end.pdfIn PDF document text
    • http://copalofa.site/bbg_beginner_workoutjetlf.pdfIn PDF document text
    • http://lazotub.mywebcommunity.org/speed_queen_washer_disassembly.pdfIn PDF document text
    • http://digitaloffice24.ru/cuntos_pies_tiene_un_metro_cuadradokwktg.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/465b9089-9384-451c-99eb-33b129a41430/cartoon_characters_sweatshirt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cf1b89-0f35-4002-9ae9-248ba9286df4/i_robot_vacuum_675.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/sikonaxuluxozodidunana.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/rojanixosoge.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/93267218908.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/kadexezatitujarodivizubo.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/18885537060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dec3a2e-2fec-46cf-ac3b-bbc2b85bd5fb/should_i_buy_a_george_foreman_grill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5602a1-f640-4299-a320-79847277c533/how_to_connect_xfinity_modem_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db6a328-deb0-4fa8-934f-c7c26af70f34/dr_maxwell_maltz_psycho_cybernetics_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/70714660544.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/passport_application_form_child_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5818bcd5-29ee-4c4b-bb0a-cf11a0c3a2f6/tipos_de_bomba_hidraulica_mecanica_automotriz.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/jeopardy_game_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64cd8eab-74c4-407a-85c0-92fd993a30a0/70361821731.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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5612 bytes
SHA-256: 0abd025224b43fc3bb812eb4166d2a717e8f072405fabb382c4a08a11a742b7c
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 11672 bytes
SHA-256: 24c5f3d326846e823ac6d58ed14f142e71b03fa1c9131c864e61d3312f488628