Malicious PDF — malware analysis report

Static analysis result for SHA-256 826c251b73298a1d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 07:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0dff1418757155cb8f3c95058193962 SHA-1: 00318447f64972dc5543e605a96dc863f9a4a41e SHA-256: 826c251b73298a1da262d8e34715ef29137e8369ecdd62e51dd40a376254c470
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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://philabc.ru/uplcv?utm_term=pikachu+movie+app PDF link annotation
    • http://duoctruongxuan.vn/userfiles/image/file/26834732107.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/finakinaninufomikulimoro.pdfIn PDF document text
    • http://asustainable.com/global/file/fetasupujuv.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/38541266785.pdfIn PDF document text
    • http://ccshecea.org/upload/files/banesujadele.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/nofujobajuluwoxazeterew.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///464524749.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/mikalazijejabelotewix.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/koxoponugujipux.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kidagur.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/56008729213.pdfIn PDF document text
    • https://lazerom.pro/media/file/71685933948.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/11349245136.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/dozoladalanib.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/vuwewirorumumikametewazi.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/nukowajodeforulobino.pdfIn PDF document text
    • http://pasaru.com/upload/files/29245006103.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/32548386823.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/20478746098.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/lanixarurimorituvan.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/galere.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/jidusovepu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161378ada9a1d2---17495072235.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10384 bytes
SHA-256: 70b4c9109bef8cd642357000f496cc25bfc0515c43609726b6528b5b4a5c2fc3
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 18392 bytes
SHA-256: de73ac76531ce3249a5e6fb37e82145154e269dcc31728eeed649f992a4be209
font_02_sfnt_off000124d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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