Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa503d225c4142b…

MALICIOUS

PDF

93.9 KB Created: 2021-03-23 12:09:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad2873c8a93514cf1360691120dbb70d SHA-1: 375ebc692647ccfae81ce493f6dd9d9488b75a0c SHA-256: 8aa503d225c4142b53200599dc346678738429b1036b0fdfb95ff9ef239fcdd4
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used for phishing or to serve a malicious payload. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

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=bakri+palan+form+pdf
    • https://cdn.sqhk.co/titubebojek/oLjdmha/xakodefukavadamowuzuvexik.pdf
    • https://cdn.sqhk.co/vajirasavuz/ifjeQhj/return_to_zombie_island_soundtrack.pdf
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/be9731aa77cafee.pdf
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/gumivatoti_noxulorizunexu.pdf
    • http://mekifaremijes.iblogger.org/ssc_biology_notes_in_english.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/kojuzesusarusawotef.pdf
    • https://cdn.sqhk.co/goworonol/ijgcggc/crossword_mysteries_hallmark_series.pdf
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/ziwodose.pdf
    • http://kifejuja.medianewsonline.com/kanumewef.pdf
    • https://cdn.sqhk.co/teduwugevoki/cjhfif2/zombie_hospital_game_2018.pdf
    • http://janafan.scienceontheweb.net/what_does_fo1_mean_on_washing_machine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://doroxokile.epizy.com/zopakefix.pdf
    • http://wiwosotu.myartsonline.com/43643551989.pdf
    • http://pabotojixupi.atwebpages.com/81029769011.pdf
    • https://uploads.strikinglycdn.com/files/154bccd2-6287-4d05-9222-a9a8ff5750fd/how_to_turn_up_volume_on_signia_hearing_aids.pdf
    • http://lobopekogolo.onlinewebshop.net/49862338307.pdf
    • http://ritabodaxitex.epizy.com/medical_terminology_worksheets.pdf
    • http://movuzawizigevej.myartsonline.com/gufijabalifexopav.pdf
    • https://uploads.strikinglycdn.com/files/193942a1-d057-43d8-b9be-2f43220e425b/english_literature_and_composition_section_1_answers_2009.pdf
    • http://rasezufolob.rf.gd/android_10_notification_light.pdf
    • http://denitotogu.epizy.com/splash_screen_with_animation_in_android.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fa.bin
a6280b1cf3d34f60be0f73705c96b45639ced192e1065d966adeefec97ff5fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 5124 bytes
font_01_sfnt_off00011259.bin
832c963c0a9551ef4d64fb564ea291feb9cdffc772963642309fb36c94bf682e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 11008 bytes
font_02_sfnt_off00013744.bin
1ab0306d601c0211ee9904e41c25f3b73cc85d859018a3cdf71ddcce7ab3118b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 16800 bytes

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