Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db4a4061b57b8b4…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 21:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 87dac54aa33133820d0550a4ff12d0fe SHA-1: 7bed101e903190137745ec64c2b6079cebed4ee4 SHA-256: 3db4a4061b57b8b4158f49c5ac74cb8f0048fde2f3e3def7a0d584880403614e
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used for phishing or to serve malicious content. ClamAV detection and ML classification strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=academic+english+vocabulary+for+international+students+pdf PDF link annotation
    • http://xorimomupajo.scienceontheweb.net/arabisches_alphabet_tabelle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_6023e96d2eff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485703/normal_604ad49ade5bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_601fd393a7e08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5ff40c755fbbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392664/normal_6030185563ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488807/normal_601fb72987730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6055c326c0242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/kuminasuxopinos.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/android_studio_in_app_billing_example.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/65104588305.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/fannie_mae_mortgage_student_loan_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/cdl_self_certification_form_indiana.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/balle_balle_punjabi_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/askariasis_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/java_free_for_vista_32-_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/sql_server_free_32_bit.pdfIn PDF document text
    • http://susabumo.atwebpages.com/which_cards_against_humanity_expansion_box_is_the_best.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/kuwadaxaro.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/dell_inspiron_n5010_laptop_display_price_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/aprende_ingles_gratis_unam.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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 5860 bytes
SHA-256: 560bc768f9531e79960333f4753fe900705170165cf4e1d307bf266a1a256b21
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10088 bytes
SHA-256: e54757318f686f69fc801bd575e17465580d3b24bab1251c1f3188cb1133cb4b

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