Malicious PDF — malware analysis report

Static analysis result for SHA-256 e29d766642345108…

MALICIOUS

PDF

87.0 KB Created: 2021-05-14 21:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0783db01352442c0234c572fff648e07 SHA-1: 7f6daedbbd014ca8c6b4e2f607482aa688641b5e SHA-256: e29d76664234510861d4e6d28894ca60e6eb6ba7b2dda02db66c0d59d22fd970
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 utilizing UTM parameters, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=audio+technica+at-lp60+usb+turntable+gunmetal PDF link annotation
    • http://pagixuzipalopa.iblogger.org/vebotevo.pdfIn PDF document text
    • http://vuliduku.22web.org/8375463549.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/dQ8NLhF/56431084930.pdfIn PDF document text
    • https://cdn.sqhk.co/sikudile/jfNT3ha/chicken_gun_mod_apk_1._7._20.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/1Egjihd/81095017153.pdfIn PDF document text
    • http://sanezukevuzav.iblogger.org/cartella_clinica_informatizzata_per_rsa.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/aparato_respiratorio_libro.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/icyFggj/rexojinojumara.pdfIn PDF document text
    • http://magonawaneku.22web.org/1150441287.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezopokus.epizy.com/what_are_the_different_types_of_intermolecular_forces_from_strongest_to_weakest.pdfIn PDF document text
    • http://tidokimutuju.rf.gd/basic_concepts_of_chemistry_notes.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_58115595f71c4828bd32d4ec6c4b47df.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_d7b5aa08eeb8412e9bcb324661ebb474.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_6ff63c0401f44274bf7fe60d352519aa.pdf?index=trueIn PDF document text
    • http://keguwaburafokul.epizy.com/wuguzimit.pdfIn PDF document text
    • http://sefowolo.atwebpages.com/kusixuwimixow.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_1ef402041f07413f913db0bf68cbc295.pdf?index=trueIn PDF document text
    • http://zajoneforisomi.rf.gd/brzezina_jarosaw_iwaszkiewicz.pdfIn PDF document text
    • http://jidoxib.rf.gd/cks_guidelines_hirsutism.pdfIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_39bdec6b7b9344deb9d0b9baeecaab46.pdf?index=trueIn PDF document text
    • https://a0f1d9c0-ea46-4e0e-9383-d87711d3127f.filesusr.com/ugd/1e3fb7_99fb9547905c48b39df017c3d6ea853e.pdf?index=trueIn 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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 5944 bytes
SHA-256: 5e2fb4b9394b2cecdb78b6ffbcfbf8f070ddc4bc811d0dbd58fd9fd4ac9c81c3
font_01_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 13024 bytes
SHA-256: 69cd5107faf59f7f6f581ebd8c6ab59169ccc750add6a1a1501648f556f23c4f
font_02_sfnt_off000138f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F2 16220 bytes
SHA-256: b5e6fc3c157f331e7490fec2ad7da4a4604a28b1c77ce1ca6a6e484032aa2fd0

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