Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1c0efc16719029…

MALICIOUS

PDF

78.9 KB Created: 2021-03-17 22:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01270ebc07f658e448c29a3e667c56a8 SHA-1: 43afa21ff981ec8c50e0a25aa94464f0a0927541 SHA-256: 5a1c0efc167190299f2d91e2028e27f2fdaeef33d74900b9f1d6d04e517088ae
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to a service manual, aligning with the 'Urgency / deadline lure' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/award?keyword=briggs+and+stratton+service+manual+pdf
    • http://servempieza.site/the_authority_of_the_believer4bopn.pdf
    • http://kawolamekepe.22web.org/motif_batik_nusantara.pdf
    • http://gagolififesaf.iblogger.org/66301708891.pdf
    • https://static.s123-cdn-static.com/uploads/4458838/normal_5ffd72ee3d9d3.pdf
    • http://bandalet.club/ispad_dka_guidelines_20176r42g.pdf
    • http://housefashion.ru/messenger_marketing_agencyb7579.pdf
    • https://cdn-cms.f-static.net/uploads/4465263/normal_60520a36ca351.pdf
    • http://specrazreshenie.com/romantic_novels_free_download_sinhalawutta.pdf
    • http://uablog.website/dr_driving_2_cheats_apk_free_downloadzen6z.pdf
    • http://zajowidased.iblogger.org/vivagegazodapibot.pdf
    • http://viniveba.mywebcommunity.org/julus.pdf
    • http://wozekozexufoxol.scienceontheweb.net/runiditetaragafukixibewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kovodolalaloru.rf.gd/what_is_a_synonym_for_subject.pdf
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_2ba253f0d03240a1851e8ff4ba090489.pdf?index=true
    • http://jegovogetaferop.epizy.com/gupazibibiguravisodona.pdf
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_8bcf0487e2174d6a85e2b28412ca2945.pdf?index=true
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_7065a06cb26b40cb9f370e6aef5ff891.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_4fbd289f08b14f9c90681d817ce7ed4e.pdf?index=true
    • http://voturugivorajop.onlinewebshop.net/77723525029.pdf
    • http://duvufewitopemaw.rf.gd/five_points_of_darwins_theory_of_natural_selection.pdf
    • http://jujageritoxo.atwebpages.com/55209036249.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_9067f1ed3e914c91a7f0f1d0b327df14.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50c.bin
1f6164fea9e32c1d456b3059dc0af06e96286cce6a2ad73d4431f0841a513d8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 5584 bytes
font_01_sfnt_off00010805.bin
98502336822fc43073e08e326e7d82a5a89821bb5ca2264e30031eba930905eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10540 bytes

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