Malicious PDF — malware analysis report

Static analysis result for SHA-256 d367e5a39ef1a477…

MALICIOUS

PDF

83.1 KB Created: 2021-03-16 11:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8850168313cbcd16dae8d7614fa753aa SHA-1: 4f02f06a260f1cc0ceaf8c6c4109c869f59c2ee3 SHA-256: d367e5a39ef1a477580f41bd198d1274252b961dded7bafd8182bea1bb548c1f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm nature suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/wix?keyword=zplayer+6.5+apk PDF link annotation
    • http://roburupagosode.iblogger.org/71651381360.pdfIn PDF document text
    • http://rubyshup.space/bifusadubolasuwivexgbfq0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424645/normal_6002e1e296fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498983/normal_6030f71a050cd.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/mipofiwepopaj.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/why_we_crave_horror_movies_rhetorical_analysis.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/99300922332.pdfIn PDF document text
    • http://belplitka.ru/can_i_report_an_inactive_twitter_accountqaeja.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/5588440.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/berej.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/dosaduvagarutiteji.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/6370584.pdfIn PDF document text
    • http://help-copyrightservice.xyz/how_to_enable_local_area_network_in_windows_10cnmfk.pdfIn PDF document text
    • https://gakurajoduradi.weebly.com/uploads/1/3/4/1/134131237/fowepomuwolup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_6026fb2b8f31b.pdfIn PDF document text
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/xenime.pdfIn PDF document text
    • http://leadtop.co/821943238986kw77.pdfIn PDF document text
    • http://liwexun.mywebcommunity.org/32203474711.pdfIn PDF document text
    • http://4escam-bot.online/71983311494r98pn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lewabebobi.rf.gd/gejalexumobokinased.pdfIn PDF document text
    • http://madulok.epizy.com/85485303610.pdfIn PDF document text
    • http://zopimubusa.rf.gd/appvalley_apk_app.pdfIn PDF document text
    • http://rofalesogunurex.rf.gd/action_research_in_mathematics.pdfIn PDF document text
    • http://dozudaz.epizy.com/fegudabiwofixox.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 5068 bytes
SHA-256: 8bd8cfc0effa54e3f81d189bb08015a00e8c074f430d592d9c96febfb32ef166
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 11684 bytes
SHA-256: 7afe6abcde2c1b6e581db36ae003ea7c2738f2ca6f1e45f85454accfa3f95f1a
font_02_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 16132 bytes
SHA-256: ca0bb856d51d4c440eb4e48db524e4b4a87bf80294704eab3ae97752e74326e1

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