Malicious PDF — malware analysis report

Static analysis result for SHA-256 f101f3cfaa14b3db…

MALICIOUS

PDF

76.4 KB Created: 2021-03-30 14:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a98986ef682c88f34b199c93e09b6ec0 SHA-1: e4e1aba7e1da9896280249be08a6bf2730d040b9 SHA-256: f101f3cfaa14b3db428550a7ef35790180c9044e60d66b17203a5c7b26d16173
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://zajinet.ru/strik?utm_term=verizon+fios+customer+service+number+human PDF link annotation
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/logosavulegoz-wudovit.pdfIn PDF document text
    • https://lafuworopiraw.weebly.com/uploads/1/3/4/3/134341657/jarowul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480580/normal_60613a9d638e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_60517ee81434a.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/60464992601.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/85676821118.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/8986850.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/hjih0Rr/towofof.pdfIn PDF document text
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/9078047.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/how_to_adjust_thermostat_on_electric_water_heater.pdfIn PDF document text
    • http://penageli.getenjoyment.net/metamorphoses_book_14_sparknotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485451/normal_5fe901d5efcbd.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/sarl_bodler_albatros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387232/normal_6011a102753b8.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/gSjjiXC/police_city_motorbike_rider_traffic_racing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/jlXwie7/file_manager_apk_uptodown.pdfIn PDF document text
    • http://zozavelomidabi.scienceontheweb.net/sub_zero_refrigerator_repair_edmonton.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hcOhcjd/75795470248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/51289977974.pdfIn PDF document text
    • http://liduvitulugug.onlinewebshop.net/rikowolo.pdfIn PDF document text
    • http://zivonupawidam.atwebpages.com/data_structure_and_algorithm_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/computer_parts_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/bitcoin_mining_android_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/new_grammar_practice_for_advanced_students.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/recruiter_training_manual.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/what_are_the_three_main_parts_of_the_mission_system.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_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 5304 bytes
SHA-256: 0bdbd0d3a2719b8e21883c6c5d8ddefdf4eadc9b7c992bac84ba7571e1e0920e
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 11416 bytes
SHA-256: 583dc9aa00e52eefbb6965fa491ce511209d936120c2a0450561971833888b64