Malicious PDF — malware analysis report

Static analysis result for SHA-256 398ce16ac778a3a0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-04 20:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6d70018935f5605f59eac6989ad6a3ff SHA-1: 5913245b442ea0897eafbff9a89357ba214c5a3f SHA-256: 398ce16ac778a3a0eb8d52f4b197a7af085fa831a245cbe95c93e33dbd2baad4
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, one of which is identified as a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to vehicle maintenance. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=how+to+check+the+transmission+fluid+level+on+a+2012+nissan+versa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407989/normal_60388e348e5d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_600da4422ad75.pdfIn PDF document text
    • https://cdn.sqhk.co/libigekukaru/ifTchaz/car_mechanic_simulator_xbox_one_eb_games.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/what_does_horus_symbolize.pdfIn PDF document text
    • http://tujodugugejime.22web.org/helm_cron_job_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/hhNiejf/battle_royale_simulator_roblox_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447098/normal_60299e30821b9.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/ijg24jc/68666980721.pdfIn PDF document text
    • http://wopedejani.iblogger.org/zafawazijosolijir.pdfIn PDF document text
    • http://hdvideo.design/71314067977po7ki.pdfIn PDF document text
    • http://goxezidoge.22web.org/minuet_in_g_major_sheet_music_easy.pdfIn PDF document text
    • http://discount50it.pro/xxxuy.pdfIn PDF document text
    • http://zabumufunesomud.66ghz.com/irmsa_risk_report_2016.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/rotipaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/rfhbhhr/the_sims_freeplay_unlimited_money_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/j2Xhcjj/51729369483.pdfIn PDF document text
    • http://about-fb-support.com/sogudowumedujajadagibuxibihvr.pdfIn PDF document text
    • http://termometr-medikal.site/92076565026lwin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fegedenem.rf.gd/rinegelam.pdfIn PDF document text
    • http://xabuvale.epizy.com/juice_wrld_lucid_dreams_piano_sheet_music.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/44589631738.pdfIn PDF document text
    • http://joxepivebafugig.epizy.com/el_arte_de_la_guerra_resumen_de_capitulos.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_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 5764 bytes
SHA-256: 89c28b6b1d982f2a3e9053ce709406736e9b8847b02ebdd24248bb8a7de295fd
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 11708 bytes
SHA-256: da8e0727f8533a176bc6ccddb8d1205225c6aee3ca7c80450fc3fdc5e36690bb

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