Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e9c6e4ef7a8d7b…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 21:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a9e1777a8f99991a6ac5eede823cfb6 SHA-1: a0e0fcb7629c8f29dcc3a3dfb3003cb65396e5d7 SHA-256: b8e9c6e4ef7a8d7b674dce226849ac9b3f059ad9d622b3578d3c03256e9c0ef8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed numerous external URIs and a link farm structure, suggesting a phishing or malware distribution lure. The document body was unreadable, but the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=god+of+wars+ppsspp PDF link annotation
    • http://prefinancovaniehypoteky.sk/res/file/fovixumibifo.pdfIn PDF document text
    • http://manu-transport.com/documents/file/diwuwej.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_051269673D293BC6.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/70644221556.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/fanofawi.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/matipenemevagili.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/85897057543.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d597641e1d---wusadodizinixufuf.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161332d03008b3---pabavotabowipiwale.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/2254051348.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/vizesoruwukalupanuvofu.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/40010121480.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109101146536883.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/27279144397.pdfIn PDF document text
    • http://yoron.net/up/files/55018403098.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/54215423429.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/23504233428.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/wejul.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/lelukiwiterakovuwurow.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912133645952.pdfIn PDF document text
    • https://okazionche.com/files/73196900390.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202193025398598.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/38422129895.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_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BE 17668 bytes
SHA-256: bcc53fc6d4e3e3ebda38f9d27cda96364b408b7ffd810817c3cec57aea97dab8
font_02_sfnt_off00011f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F99 10144 bytes
SHA-256: c7813683cfb655b868fb804315d7d1cc0c522c9ce92d05040ba6c9a97570cf6e

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