Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3866109ea3365d6…

MALICIOUS

PDF

90.0 KB Created: 2021-03-11 22:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8c256f01d1f760cbbbda576f845eba3 SHA-1: 4af75205c1ee27ddead2c8fb361d2daca0e813b2 SHA-256: a3866109ea3365d6b2737c857c4580e1735be2ac02630f32118dcb020000241f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1140 Deobfuscate/Decode Files or Information

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing lure for MFA or one-time codes. The embedded URL points to a domain that appears to be part of the phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to trick users into revealing credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/award?keyword=security+controls+evaluation+testing+and+assessment+handbook+pdf
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fffbb26cc813.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_601da0432fcf3.pdf
    • https://cdn-cms.f-static.net/uploads/4421782/normal_601dc318d2aa4.pdf
    • http://japarof.mywebcommunity.org/sql_server_tutorial_for_beginners_with_examples.pdf
    • http://vesajob.getenjoyment.net/36502158628.pdf
    • http://buvalopexur.mygamesonline.org/29402112397.pdf
    • http://dexuposi.sportsontheweb.net/pomumovom.pdf
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5ffac3954317c.pdf
    • http://waranijovuv.sportsontheweb.net/how_to_find_ip_address_in_command_prompt_windows_10.pdf
    • https://cdn-cms.f-static.net/uploads/4467043/normal_604461de6a728.pdf
    • http://julapekawej.22web.org/kapeludaliponuxur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://kesotufujurox.rf.gd/background_eraser_and_remover_pro_apk.pdf
    • http://faberaladaruz.epizy.com/gulerareromorapakizeweg.pdf
    • http://sobogasitizi.epizy.com/purple_color_background_wallpapers.pdf
    • http://xorewabamav.epizy.com/98553575813.pdf
    • http://limoxukuk.atwebpages.com/mi424wr_rev_f.pdf
    • http://jezowadu.epizy.com/57923767836.pdf
    • http://notumaxesi.epizy.com/durchschnittliche_nderungsrate_aufgaben.pdf
    • https://s3.amazonaws.com/moduxanakuri/migalalikim.pdf
    • https://s3.amazonaws.com/wefadep/xepona.pdf
    • https://s3.amazonaws.com/nufidibodudulad/kejozatoxinovo.pdf
    • http://wavepenaxega.epizy.com/xiwojuli.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_off00011474.bin
077be70e4714d89d5bfcb3b5fe7dbb30fc824e9153e9e2892db39feab37274c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 5920 bytes
font_01_sfnt_off0001286a.bin
7b6800243c758d427c56a51e442c308d6cabc2336aff72b4bd30f9cbfaa51064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 10416 bytes
font_02_sfnt_off00014b88.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 4324 bytes

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