Malicious PDF — malware analysis report

Static analysis result for SHA-256 df38d94068134772…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 22:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76bcdad9c14d09cb2d27831145d1747a SHA-1: 2ad566aeec140f2ce338ec7891a0c3ee650980da SHA-256: df38d940681347726587d248d12e7096329b3669bcbe54234f0044496a23d136
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, pointing to a link farm strategy. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://classykitchen.pl/web/uploads/files/76774504559.pdf In PDF document text
    • http://shriramashramssschool.org/userfiles/file/wokudexojuwonodawavi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d89bb97d---fuwizejabumitejavixegi.pdfIn PDF document text
    • http://npas.ru/pic/file/76797164672.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/88485984997.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/12177256864.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wobufumisapalezofu.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/48171318842.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907040407849875.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bazakovipudisozelibe.pdfIn PDF document text
    • http://analhospital.net/file/files/8465653948.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lofegomovo.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/moguz.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/17748742886.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/44775842856.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/13978899912.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/9277208559.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/82504263468.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/xirebipuwininan.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sonizaludelurolegaturu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+fire+new+update+apk+modPDF link annotation
    • 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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 17412 bytes
SHA-256: cb81b3b2f99110d4bcc832fd340ac0f26b8a69352cda5a9f2d60fdbe9fa02a92
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 10700 bytes
SHA-256: fc1bfcb66d48d90856c9610577d8bf1dacc4a2637b6cdfce68497dbce84e3532
font_02_sfnt_off00011b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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