Malicious PDF — malware analysis report

Static analysis result for SHA-256 e394a45ccf30d665…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 03:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 441fed214e3678ec136c7df8de58f024 SHA-1: bc47b393adcc496877490fe0d5e5833d2ef8a1d8 SHA-256: e394a45ccf30d6655218311b004875ee51c0209c23aea64dc3b06c1f81479a0d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=ios+free+habit+tracker PDF link annotation
    • https://lotteppta.com/beta/assets/file/xidilok.pdfIn PDF document text
    • http://sun-eko.eu/files/file/botit.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210908085636.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/wuzununubizap.pdfIn PDF document text
    • https://fasleh.net/Files/files/22888086036.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/vifemorutasatixa.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kejizafome.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/54103247517.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab5a52045fe3f428e5f02aaed0c4e62a/zibipo.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/gamiz.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/ditamukew.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/nulox.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/030559287965.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/pufimunor.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef387dad15---90033754729.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/57917828035.pdfIn PDF document text
    • https://oferta.lt/i/File/1366537249.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613fe5c89cc67.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/65918464477.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/lofijidubolufesof.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202192848415942.pdfIn PDF document text
    • http://industra.sk/userfiles/file/degawiso.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/43109894111.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/19146943809.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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 10464 bytes
SHA-256: c7f27baf0fd82c97fd4396f9545f2b6addc91559337b191c9c6dc5cf3d74938d
font_01_sfnt_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 15224 bytes
SHA-256: 9f24742e2078f94c80115527728903da931e0a9767cf229bb009ee0b556f8dce

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