Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f8b76a5c5726b1…

MALICIOUS

PDF

87.9 KB Created: 2021-06-01 15:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fb3c28d437a786d3a0fe308d27e25710 SHA-1: 5634e5708d7ff7f10430f18c5936df19506b2ba3 SHA-256: 10f8b76a5c5726b1395f0a3ec5fed3453da4fc7a561b2c10f6033b6ba7f426ac
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, suggesting a phishing or scam attempt to redirect users to a malicious site. The document body contains garbled text, but the presence of a URL and the heuristic firings strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/pbw?utm_term=can+i+still+use+el+capitan PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/141814db-45f9-4f4e-bd61-69b57f2554f3/handpunch_3000_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfb8c2b4-9c1a-43f5-bdf5-99693e9ea162/whats_the_best_order_to_watch_marvel_films.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3941527a-67c2-493f-a40b-648087f72a27/49896169805.pdfIn PDF document text
    • http://natizasex.pbworks.com/f/simon_vs_the_homosapien_agenda_audiobook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3615a85-7eb5-40f5-99a2-b7c139be81ab/6070721568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92ef5e74-9c63-4aa3-9e60-651bdac3c71a/6730941558.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/w/file/fetch/144427449/how_to_make_gelatin_sheets_from_powder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5290ec72-b955-4354-8f0e-79af884bf656/22000404815.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/laudate_dominum_piano_solo_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f310c29-91cd-43ac-b2ae-59aaf7c49d09/95551357010.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144419436/35090846562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16c7107-c688-4147-a74b-cdd922f5365e/muscle_gain_workout_plan_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a8a21a-6bdb-45bb-8b71-e90623e999cb/world_history_textbook_10th_grade.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412260/36910845917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a009d605-7662-4098-8d0f-faa4300d4831/ap_biology_chapter_1_introduction_themes_in_the_study_of_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848d68e1-3472-4a9a-af3c-b146af320ab1/xotoposiweva.pdfIn PDF document text
    • http://fufitiruw.pbworks.com/w/file/fetch/144426090/xojavudubedatiwuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8745a40-9a07-4f62-922b-f333aef96b51/how_to_calculate_air_flow_rate_from_pressure.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427812/butonapujanixizunidogo.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/happymod_apk_for_windows_10.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144463155/kopuxezudawaseniforesera.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/28093143871.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/f/gevor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1c3b95-587f-4592-963b-23e4aea50963/polaris_sportsman_450_service_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 4736 bytes
SHA-256: 13901b0ca8adbd922f08afbe3e2cfbd18f5fe36d6d51cb1168d5af2a30c6e2e3
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 2528 bytes
SHA-256: 161c3714e592dcce582c42e099e6b5ea66955031a2744d76d1c98d8655006e47
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 14528 bytes
SHA-256: 7a0ac39cc34914220776247b004978bb9d2c869d126601b790b44757e67bd92c