Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf158c33837527d…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 00:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cee87f72e1bfc9070b5b4248a3cb753 SHA-1: 6f15c3eda976a2649ac7e2f49c607056097c4b0b SHA-256: ddf158c33837527dc7dfc115072edb0eebba89346853fe74fd42594e4878e460
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=android+viewer+on+pc PDF link annotation
    • http://855solution.com/htdocs/cljr/data/files/63751232683.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/38380312212.pdfIn PDF document text
    • https://12waktu.com/contents/files/11342536981.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xorunumuno.pdfIn PDF document text
    • https://people11people.gr/uploads/File/51902032562.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/50908766709.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/limew.pdfIn PDF document text
    • https://saya.ro/app/webroot/files/userfiles/files/29601321178.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/81008491456.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140b933366d7---3731315265.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/xatofajoxavanuzanisuvaj.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/muxutajurarasap.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/vawosuruvoviladulelisatu.pdfIn PDF document text
    • http://sireny.net/share/files/87884218253.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/23534293364.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/12298504823.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/18039804012.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614242bd504a5---97518197537.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/68943519522.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/47133132211.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/tolezezak.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/78863907174.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/xajimakim.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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 17380 bytes
SHA-256: 4db9c0e1162026a2d7aef1e76facd5f1f39f60feff2444be97c379c41082520e
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10164 bytes
SHA-256: 9a0d318813bbcd8dfd8bc08088b517d784d06bdce236ef35490a2c98f75d3b5e

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