Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a42db1998a5ca0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 03:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45eb061cfce887514b5566abc037a597 SHA-1: 1280d048b9ca8dff33b808ecde0663d276a8ee6f SHA-256: 86a42db1998a5ca002aafcd5d1f8051390b5c11b2ac89fa58acb979eaa35f4f5
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 multiple heuristics as malicious and a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/strik?utm_term=scag+61+turf+tiger+price+new
    • http://uber-global.com/dell_studio_540_motherboard_diagramr8a7v.pdf
    • http://workshop-fb.ru/highway_tourism_and_travel_driver_jobs_in_dubai4bn04.pdf
    • http://vusejulene.iblogger.org/40317465556.pdf
    • http://cartest.pro/lizexafefifaxuxizipokuker2eeuj.pdf
    • http://digitaltoolsfor.xyz/dapuzivimetew90jhp.pdf
    • http://tetizeniwa.mypressonline.com/unilever_indonesia_annual_report_2020.pdf
    • http://letnesil.xyz/55257662839nhs0y.pdf
    • http://lanujozawodu.sportsontheweb.net/64816566989.pdf
    • http://comp-arenda.site/926734922539wqsd.pdf
    • http://stavki-na-sport.site/rerod5suhg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39ffd324-9d64-474e-93ca-6311a970dc95/math_worksheets_for_2nd_grade_multiplication.pdf
    • http://tetexamafikej.epizy.com/renorixovekosidusideko.pdf
    • http://derefoxawuziten.rf.gd/mens_formal_shirt_size_guide.pdf
    • http://lokokojorivumi.rf.gd/audited_report_date.pdf
    • https://uploads.strikinglycdn.com/files/246c7079-d419-49b1-93c9-ae0f6b1231c6/wexorar.pdf
    • http://letutemoxeluz.onlinewebshop.net/nujad.pdf
    • http://befokube.rf.gd/26359482362.pdf
    • http://gugamofizuxeg.epizy.com/custom_printable_calendar_templates.pdf
    • http://dakezemafatelo.epizy.com/sigumubafofuwi.pdf
    • http://renodiwug.epizy.com/pemujow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dada.bin
21e63acc5c0b775b53736f2e95399deae8dcf11c2ac48e2609b687b074786670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 5372 bytes
font_01_sfnt_off0000ed4d.bin
8bdb2542d3f14b5a7d21a405971506e9944ee1f72d4604f0b28ecd2bdfb1d24a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10676 bytes
font_02_sfnt_off000111d9.bin
29250e7ed8ab1b14045cb895842f970f352a5bc0cc5da4922efcc139592812dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 17380 bytes

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