Malicious PDF — malware analysis report

Static analysis result for SHA-256 614dbe3999c81383…

MALICIOUS

PDF

126.7 KB Created: 2021-06-04 16:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5498243392ff190c2a9b42756cedc409 SHA-1: 818529c7d1db5146fa280b4f36e2d6c57c60f314 SHA-256: 614dbe3999c81383f21c737c509504168376f61b57681a1ebed54e556155936e
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It contains external URIs and is structured as a link farm, suggesting it's designed to redirect users to malicious sites. The presence of lures for remote support tools and password-protected archives strongly indicates an attempt to trick the user into executing a payload or granting unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/pbw?utm_term=autodesk+revit+content+libraries+2016+download 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/2bbd8f7b-4585-4a37-af3f-a2c0260041c1/the_hunger_games_2013_movie_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7d1503-a14d-4051-883a-696a222cd928/rozoxuzulaxulasinixix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789039b2-7e8d-4c22-87d8-70998c0e7e07/xadumu.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/myles_munroe.pdfIn PDF document text
    • http://kefimazusob.pbworks.com/w/file/fetch/144575061/disadvantages_of_norm-based_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f68958a-8715-4ab1-bac2-75f7ec86ced7/push_by_sapphire_summary.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/can_you_play_cards_against_humanity_with_3_players.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144444294/inspiron_15_5000_series_drivers_download_win_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4742ad6f-071b-4a36-af56-8b06d2dfa90d/18753454306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8937f61c-17a5-44d4-97ff-682b417c14bc/xuvawego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de56e4ac-e797-46ee-9ff0-ca4f2d2c70e9/demixupadexosemol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2572f1b9-58ef-420c-ae5d-72443b17f9f8/lista_de_verbos_regulares_completo_em_ingles.pdfIn PDF document text
    • http://lorugaz.pbworks.com/f/fipakesugofoparav.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/19465992423.pdfIn PDF document text
    • http://jifesepapo.pbworks.com/w/file/fetch/144448539/acer_ht2000_motherboard_mcp61pm-am_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4be3835-687a-4b5d-89cd-5f278f959f43/kifabepidilosokofawedo.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/how_to_start_keto_diet_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/516786d8-0dfa-42da-aafa-da002609178c/what_are_the_major_characteristics_of_romantic_poetry.pdfIn PDF document text
    • http://kirozatijawu.pbworks.com/f/shark_ion_robot_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88c4ddf-b629-41ee-bea9-c99d86c31f2f/lamborghini_gallardo_spyder_performante_lp570-4.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001cc78.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CC78 19184 bytes
SHA-256: 91273257ef6f8b521540a0a0dd3f5d9be5186d592a74a58a4baab3ad4a29ec34
font_00_sfnt_off0001885e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1885E 5760 bytes
SHA-256: c7b1af0be528e9c48a8624382d56fa8bb1a21005b60368251e05b2d0d8a46f03
font_01_sfnt_off00019c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C21 15500 bytes
SHA-256: 7e14a33f8753458d937e6abc08845df230481a56a9429145b10fe5ccc0ee0e7f