Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c92fe996b7e351…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 02:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dbb17549d74e9ac86610b89bfa0a5360 SHA-1: e69f59ec3e8781f01be384cf7ce473a788f97a8b SHA-256: 97c92fe996b7e3511384eed176baf6c9445fc5306b76d5d89537e696caaa535c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or link-farming operation. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://drafthe.ru/uplcv?utm_term=fish+frenzy+apk PDF link annotation
    • http://hawaiisushi.iorderfoods.com/uploads/files/68703292633.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/87540616606.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/zinapo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/pejaxozi.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/83162939470.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/1603239025.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/39387372670.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bekeliwewemuratupap.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/79995476401.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/rufuludijulowegimot.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/14428460031.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/34589557979.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/sininomiser.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/86540225560.pdfIn PDF document text
    • http://lagrupacio.cat/file/28355582638.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebfe0a729---venojigeguf.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/notaduwutu.pdfIn PDF document text
    • http://ubest.ru/images/file/93424540521.pdfIn PDF document text
    • http://air-con.ru/upload/files/kenisowajovut.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/5005651603.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nadusoxuzoxogip.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/37900114314.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/wepebeleturoxuzobuwitoxe.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/39733901256.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/xijuwuvep.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_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 18464 bytes
SHA-256: d21626a3464c0de4a317c120f90b90436e2c6435adb505a9780fc507b3432991
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10432 bytes
SHA-256: 7124bfeebd64949d8a95c4a13cfe5eca699a884688b7f60284f9c85795771a82
font_02_sfnt_off000121cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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