Malicious PDF — malware analysis report

Static analysis result for SHA-256 f185ab0ab87efb82…

MALICIOUS

PDF

135.9 KB Created: 2021-03-10 21:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2105cf90de13405af3fe978c8ebed3a1 SHA-1: 7985dc2ee16ee9c8244fc9ca854f0f928aa6a440 SHA-256: f185ab0ab87efb8206bf32e782a635ac4dc32fffdea2c2f0c86378e01292f3d5
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous external URIs pointing to disposable domains, with one notable URI being https://baarspo.ru/aws?utm_term=what+are+the+requirements+for+the+canadian+military. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://baarspo.ru/aws?utm_term=what+are+the+requirements+for+the+canadian+military PDF link annotation
    • http://budokudepa.scienceontheweb.net/51172545154.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/85689101114.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/paroruk.pdfIn PDF document text
    • http://hellochildren.online/lessee_information_sheet_subsequent_filing78rvx.pdfIn PDF document text
    • http://tells.fun/xatiji8dsr9.pdfIn PDF document text
    • http://ihsteam.ru/dixoxuxenegemuzusubupori2ptva.pdfIn PDF document text
    • http://alsamcctv.com/barbie_movies_in_tamilbnkyc.pdfIn PDF document text
    • https://linezeludamaxen.weebly.com/uploads/1/3/4/3/134340908/fbc0412171e27.pdfIn PDF document text
    • http://trylait.pro/toyota_way_14_management_principlesd2mjm.pdfIn PDF document text
    • http://workbykoder.xyz/kofufotexugiwigujc4rxp.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/sasebozefob.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/mibonajubevolomi.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/what_was_the_first_english_translated_bible_called.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/zuvifox.pdfIn PDF document text
    • http://alexsaf.ru/83708692558vy6w6.pdfIn PDF document text
    • http://indital.space/safety_1st_fever_light_thermometer_instructionsreq1i.pdfIn PDF document text
    • http://itgermany.net/40937238141zwnff.pdfIn PDF document text
    • http://opit.space/weekly_planner_template_2019bd84w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rasezufolob.rf.gd/variety_show_korea_2019.pdfIn PDF document text
    • http://vuxafijo.rf.gd/23056862006.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/bitdefender_antivirus_plus_2018_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/duwinesatukekoruf.pdfIn PDF document text
    • http://zipemoluligera.myartsonline.com/20352926396.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/target_market_analysis_format.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/45178701551.pdfIn PDF document text
    • http://kegibuluwuridof.epizy.com/tawonovikizirilum.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/case_study_sample_philippines.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_off0001d274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D274 5500 bytes
SHA-256: b3961d10a913f25a8f6331fe749eaf38e63f0d2bbd704f247a7bc58ad239991b
font_01_sfnt_off0001e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E512 12388 bytes
SHA-256: 42060ff96eee9a651bca6b94baf17c7c18b0e432f63934e1836789b3c5abcc73