Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aca69ed07c6da94…

MALICIOUS

PDF

132.0 KB Created: 2021-04-02 09:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a4faba195281f161208f9ff7fd0694db SHA-1: cc21b9d1398d2086ab8602673a5662ad25f399d4 SHA-256: 1aca69ed07c6da94ac5d1a331a48c01866991dfaac58065c93939abd7127f4bd
184 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic. The document body, though heavily obfuscated, contains keywords related to 'biography mother teresa pdf', indicating a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7911

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/award?keyword=biography+mother+teresa+pdf PDF link annotation
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/e21e2.pdfIn PDF document text
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/gimoziditobo_bedipobesevaju_kurubudik_tawipijopora.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/iirhg01/dobetipuridotifaga.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/yXTiigg/hd_camera_app_download_apk.pdfIn PDF document text
    • https://zojegidaluvimov.weebly.com/uploads/1/3/4/1/134109086/8503515.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/gowomigotivijolad.pdfIn PDF document text
    • http://wexixexebasober.22web.org/enzyme_activity_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/ibnmiUs/how_to_use_hyperspace_navigation_station_nms.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/Egc5ibA/13960522919.pdfIn PDF document text
    • http://xolidila.iblogger.org/nextbook_8_inch_android_tablet_recovery_mode.pdfIn PDF document text
    • https://xigowobil.weebly.com/uploads/1/3/4/6/134645495/93b019.pdfIn PDF document text
    • https://cdn.sqhk.co/sututidogo/iiid2jc/bamefuk.pdfIn PDF document text
    • https://cdn.sqhk.co/revogonesox/83ijJUs/mopanilufetero.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/Ljjgdcx/bandi_wear_promo_code.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/jjgieHS/joxapekavavege.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/a3721029-db82-4ac7-b7d8-2ae781de9660/vuworomawezapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c51be7-97d2-4c4e-8330-6bf2d836a441/the_courts_of_heaven_prayer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559dab84-d4bf-4ede-94ed-37f6167ccfd8/what_is_the_most_effective_skin_lightening_cream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dbe9c7e-e13d-48d0-b6b8-c7cbd70ffd6d/56980261820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae6dc49-8079-4041-b729-9eebefc60d3c/how_to_update_hero_4_silver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf4b74c-861d-45fb-95bc-4a2c5dbcaa5e/2113789637.pdfIn PDF document text
    • http://misolud.epizy.com/fitohormonas_auxinas.pdfIn PDF document text
    • http://togugufi.epizy.com/elements_of_electrical_engineering_notes.pdfIn 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_off0001d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1CE 5576 bytes
SHA-256: e3b8b707862e94f4793079d8df657eadc117202d03931ce239e1addfe6e45171
font_01_sfnt_off0001e4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4A4 13100 bytes
SHA-256: 8a4cc86058ada3bce3d2c8a8991b82951b6a539283181a66cf83e56d987b52dc