Malicious PDF — malware analysis report

Static analysis result for SHA-256 363a71b4fe54e027…

MALICIOUS

PDF

79.4 KB Created: 2021-04-29 06:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e6ea3cec811c31f9cef890a1acad2ab4 SHA-1: 94043e1a092cad3bad3ea49e936b219ff659dd1d SHA-256: 363a71b4fe54e027766dc57f81a66a1b9c41edfaa12a61e57ce0adcac3e95231
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 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+cheat+in+gre+exam PDF link annotation
    • https://cdn.sqhk.co/suxepemup/fFxsMt4/best_preschool_learning_apps_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/bigidP4/history_of_marco_polo_hotel.pdfIn PDF document text
    • http://sifinujox.sportsontheweb.net/fiziteramofekunepi.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/how_to_fix_proform_elliptical.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/fjiieTA/csr_racing_2_pc_apk.pdfIn PDF document text
    • http://kewavixim.22web.org/new_audio_song_in_tamil.pdfIn PDF document text
    • http://xutarima.22web.org/8697789240.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/lupunukifekaxuxiweka.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/fojedotabo.pdfIn PDF document text
    • http://siwikilapezufi.iblogger.org/ethnographic_research_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/medijamowole/aphdYid/bafofonakekozizuwut.pdfIn PDF document text
    • https://cdn.sqhk.co/suxidixip/fK7iaji/etude_house_face_mask_description.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/f14ffbb8-ce78-473e-b301-547d1634060c/vegetable_harvest_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1deb75-437c-403e-b80e-f949e2d1449f/oregon_650_vs_650t.pdfIn PDF document text
    • http://mipitevana.epizy.com/75867758822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c450c42f-6bdb-4b08-bd30-96a3e3ee0981/how_to_use_primo_water_dispenser_coffee_maker.pdfIn PDF document text
    • http://nununad.myartsonline.com/game_of_thrones_download_in_tamilrockers.ws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0021ab2-1a79-43cb-b769-731f1af2a478/what_is_the_color_for_2021_new_year.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_77020a8a365249f597f62cf531f53b22.pdf?index=trueIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/manorumuxifevi.pdfIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_7a4c41ccef9e4779a80597de6b20dc60.pdf?index=trueIn PDF document text
    • http://gajutar.onlinewebshop.net/editable_bingo_template.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_f21b1a6b0ec544c7aba2bbea93877d0e.pdf?index=trueIn PDF document text
    • http://vezapuro.rf.gd/intro_to_psychology_nyu.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_1f088dba82c14635b35c1d1bbf8e29bd.pdf?index=trueIn PDF document text
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_a9961168183c49e2b1ef22f7610a6e70.pdf?index=trueIn 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_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 5124 bytes
SHA-256: aefd9a815c26dad185704bc9288bf02833f62ea5b74ab15e80375b5b6e137b39
font_01_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 11208 bytes
SHA-256: d7fc947aa20ababe604029be6c87e2cab400f7d671f286b469113cb7047f2e08