Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bad848ff0c91bd0…

MALICIOUS

PDF

80.5 KB Created: 2021-03-04 20:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38f2f951b3f3a88176b21a8a06dbef05 SHA-1: 76e8e5e146b2163c520d065e4132ba11f917343c SHA-256: 4bad848ff0c91bd0922dcbbdfbfd79be625e460983d18211e522162d76d9a7e8
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, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of 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://lozipotod.ru/wix?keyword=handshake+theorem+graph+theory
    • http://pikogoxo.iblogger.org/wavuvevimege.pdf
    • http://jikusofare.mywebcommunity.org/ranco_fridge_thermostat_adjustment.pdf
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5feb2baec4a76.pdf
    • http://my-favshope.online/55417404635wmanr.pdf
    • https://cdn-cms.f-static.net/uploads/4496605/normal_601f45d236ecc.pdf
    • https://static.s123-cdn-static.com/uploads/4367005/normal_5ff80efb4d355.pdf
    • https://cdn.sqhk.co/sowanigog/hQ3eCPT/red_roses_meaning_numbers.pdf
    • https://cdn-cms.f-static.net/uploads/4388412/normal_60378190e2b5c.pdf
    • http://teksalle.xyz/56750654615fn8hc.pdf
    • https://cdn.sqhk.co/nuzifixe/bihijit/fabedaguna.pdf
    • http://bidizujimon.getenjoyment.net/a_dolls_house.pdf
    • http://famozosivupiwij.sportsontheweb.net/95826117170.pdf
    • http://jepegupunu.mygamesonline.org/how_to_describe_phrase_structure_in_music.pdf
    • http://microbladingcertificationdfw.org/ardhanarishwara_stotram_in_telugu_songs8m4ag.pdf
    • http://jemulobapamiwu.mywebcommunity.org/rutelorisumet.pdf
    • http://theboldpantsproject.com/ikea_king_size_platform_bedst15wz.pdf
    • https://cdn-cms.f-static.net/uploads/4466366/normal_6018876dd4d3f.pdf
    • https://cdn.sqhk.co/jumifokujuje/igic7ih/zenededamopivafuxidu.pdf
    • https://cdn.sqhk.co/zukivutos/hhwQjX5/38942316561.pdf
    • http://xafopawiki.medianewsonline.com/fakemusesopakekigodo.pdf
    • https://cdn.sqhk.co/kezixowog/dIMckjh/download_wacom_inkspace_app_for_mac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puligop.epizy.com/happy_birthday_wishes_in_marathi_free.pdf
    • http://xinozotaga.rf.gd/87157570869.pdf
    • http://monufojama.rf.gd/bapatopidusonowaze.pdf
    • http://geforagegi.atwebpages.com/conservation_of_energy_problems_worksheet.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/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000e8ac.bin
faed15afb4bdf24c35744464e365d35f30fa365c78637c9d39445fadc327943f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5468 bytes
font_01_sfnt_off0000fb21.bin
fcb69ed1c236b744c0bd8d2f1392d0be91b5dd6dc1f34288b7ea96999beb3259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 10336 bytes
font_02_sfnt_off00011ec6.bin
f7282090e270060608fdc575ded0b184a97243f724fc845514d2e81390c10c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16144 bytes

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