Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2dc7cbde3fb5de…

MALICIOUS

PDF

76.8 KB Created: 2021-05-05 19:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d4e798d712f7821eec5c73983e0672e7 SHA-1: 206d02e736df1157e70812fff71f995e8e1e83e1 SHA-256: 2a2dc7cbde3fb5deefc7469d9d5dedfd5ff59cd8d669300d6187672c3dd0e4f3
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains embedded links, with one pointing to `https://dafemum.ru/strik?utm_term=how+do+i+reset+my+acurite+weather+station`, which is identified as a known malicious redirector. The document body, though partially corrupted, suggests a lure related to resetting a weather station, indicating a phishing or credential harvesting attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=how+do+i+reset+my+acurite+weather+station In PDF document text
    • https://cdn.sqhk.co/tumosirewuw/djGjggi/pocket_door_lock_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/rixakowu/iciggih/52285145926.pdfIn PDF document text
    • https://cdn.sqhk.co/timafewa/Uz0Pidn/21796690354.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/ckha0jc/epic_cube_dashboard.pdfIn PDF document text
    • http://noxugimeto.iblogger.org/trastornos_animicos.pdfIn PDF document text
    • https://cdn.sqhk.co/pisapaxosabo/cppih7O/72777237917.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/YZhbPgi/senior_brand_manager_salary_nyc.pdfIn PDF document text
    • http://fekosuse.getenjoyment.net/is_texting_ruining_your_writing_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/vjgXAeI/musalet.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/29505442735.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/how_to_write_big_epsilon_in_latex.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/173b9fe3-e93d-4b6e-a302-613b06af5293/welegesinibovax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/669eaa00-c329-470e-9823-5783c9dfeab6/memaweriw.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/sq8_mini_dv_camera_manuale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec73dfca-3b4b-4a59-a17f-666ef7875d7d/fnaf_song_left_behind_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/797f9659-2f33-4fe2-9e3e-93712ddbbc47/sidow.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/basefivofojukukiminixel.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/jovumopakud.pdfIn PDF document text
    • http://susupufewowe.epizy.com/23772854088.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/que_significa_soar_que_se_me_caen_todos_los_dientes.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/15793072107.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/nofuguzarimo.pdfIn PDF document text
    • http://lamoren.rf.gd/free_budgeting_planner.pdfIn PDF document text
    • http://dedufaga.rf.gd/xazudazadogetujoz.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 5300 bytes
SHA-256: b2d0dbe593daa464fe882676912e6ae627d5a483e24bcfdfd18c26525558ef07
font_01_sfnt_off0000fe26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE26 11084 bytes
SHA-256: 187b9f7dfb5e55304cf946f887a475314bcaf645990bd5331615272b26ec6117