Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b1aab6d2189089…

MALICIOUS

PDF

244.9 KB Created: 2021-03-10 19:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f4bd6d2b5dbf6d53392823b5a0f32e6f SHA-1: 9d1cc864c4194cbf0065285ebe9f76c509a640f2 SHA-256: c3b1aab6d2189089a740bfe33d1217fdc99dca358e355b529ca5d81b36c53845
172 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that impersonates Citibank, a critical finding from the SE_BRAND_CREDENTIAL_PHISH heuristic. It contains an external URI pointing to a suspicious domain, likely part of the phishing workflow. The ML classifier also flagged this PDF with high confidence, and ClamAV detected it as a phishing trojan. No scripts were extracted, but the presence of embedded URLs and the phishing lure strongly suggest a credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/4748316.pdf.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=personal+loan+request+letter+to+boss+pdf PDF link annotation
    • http://lufoveferezudu.22web.org/949040433.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/4748316.pdfIn PDF document text
    • https://radofagomomixa.weebly.com/uploads/1/3/4/1/134132329/nejenotenogadenu.pdfIn PDF document text
    • http://gulibej.22web.org/40749961704.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/perobumerafadigozumaredun.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/vazixulaxokovakamew.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/newborn_girl_outfits_for_photoshoot.pdfIn PDF document text
    • http://goshop32.site/diario_de_greg_3_pelicula_completa_en_espaol_latinom0oat.pdfIn PDF document text
    • http://winclean-shop.space/ley_modelo_de_la_cnudmi_sobre_arbitraje_comercial_internacionalhz919.pdfIn PDF document text
    • http://hytri.com/388264031831uwla.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://livivisobozi.rf.gd/who_make_danby.pdfIn PDF document text
    • http://muropep.epizy.com/ramumulizisifarobeba.pdfIn PDF document text
    • http://lapesuzimu.epizy.com/how_to_use_self_clean_on_magic_chef_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b989c067-4e63-42d1-8e60-008237d99dde/41622133266.pdfIn PDF document text
    • http://wumikexenuge.epizy.com/90319413101.pdfIn PDF document text
    • http://sewekovekejir.epizy.com/giforijagaroxinebose.pdfIn PDF document text
    • http://luvufipujadazik.rf.gd/chammak_challo_song_video_hd.pdfIn PDF document text
    • http://timavutiziv.epizy.com/secadora_samsung_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94882c81-9db0-424f-8f16-03249377533e/97892883028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c250ec-e978-47c1-8744-08efa3b2ea22/97351028644.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_off00038035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38035 5136 bytes
SHA-256: 26f71f2afd4fda7eac540e058e3dcab6b05e50156310d29b71d5f6bed83edf8d
font_01_sfnt_off000391a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x391A6 11024 bytes
SHA-256: 2d307daabafbd179e1ab8b6c23ed53377aed92c01b3e40d9fabb762c4d6324f3
font_02_sfnt_off0003b6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B6E7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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