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) First seen: 2026-06-04
MD5: b8c256f01d1f760cbbbda576f845eba3 SHA-1: 4af75205c1ee27ddead2c8fb361d2daca0e813b2 SHA-256: a3866109ea3365d6b2737c857c4580e1735be2ac02630f32118dcb020000241f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1534 Steal Session Token T1056.004 Web Browser

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and an MFA lure, designed to harvest credentials or session tokens. The embedded URLs point to disposable hosting, further supporting a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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/award?keyword=security+controls+evaluation+testing+and+assessment+handbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370528/normal_5fffbb26cc813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478933/normal_601da0432fcf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421782/normal_601dc318d2aa4.pdfIn PDF document text
    • http://japarof.mywebcommunity.org/sql_server_tutorial_for_beginners_with_examples.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/36502158628.pdfIn PDF document text
    • http://buvalopexur.mygamesonline.org/29402112397.pdfIn PDF document text
    • http://dexuposi.sportsontheweb.net/pomumovom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451377/normal_5ffac3954317c.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/how_to_find_ip_address_in_command_prompt_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_604461de6a728.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/migalalikim.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/xepona.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/kejozatoxinovo.pdfIn PDF document text
    • http://julapekawej.22web.org/kapeludaliponuxur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kesotufujurox.rf.gd/background_eraser_and_remover_pro_apk.pdfIn PDF document text
    • http://faberaladaruz.epizy.com/gulerareromorapakizeweg.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/purple_color_background_wallpapers.pdfIn PDF document text
    • http://xorewabamav.epizy.com/98553575813.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/mi424wr_rev_f.pdfIn PDF document text
    • http://jezowadu.epizy.com/57923767836.pdfIn PDF document text
    • http://notumaxesi.epizy.com/durchschnittliche_nderungsrate_aufgaben.pdfIn PDF document text
    • http://wavepenaxega.epizy.com/xiwojuli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 5920 bytes
SHA-256: 077be70e4714d89d5bfcb3b5fe7dbb30fc824e9153e9e2892db39feab37274c4
font_01_sfnt_off0001286a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286A 10416 bytes
SHA-256: 7b6800243c758d427c56a51e442c308d6cabc2336aff72b4bd30f9cbfaa51064
font_02_sfnt_off00014b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71