Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05fb227c86953ac…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 196756adf83ac1edfee4e2d764a35bc1 SHA-1: 9dd67436c297831dfba238f75ef64013a00e9000 SHA-256: b05fb227c86953acf8dca10a8853a7e18893076574066a21bb0b696d3106a4d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=moto+racing+club PDF link annotation
    • http://itemclinicchina.com/ckupload/files/wajitexa.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/4960348719.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/33430045760.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/59716094206.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xamimavuvebo.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/kesefotanunodudega.pdfIn PDF document text
    • http://chamdure.com/DATA/files/71460150504.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/gumisafejikizaxediwawiw.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/43331052679.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccce43c14f---29432177103.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/famipugotur.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/41393276489.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/16682392719.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210915_EA4758459FCA21E4.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zudaxi.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/tumuwanonepuririf.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/21609934385.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/foxowupom.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16146611d0938a---lorepuzo.pdfIn PDF document text
    • http://kd-council.com/upfile/files/vifowofuretixenewusor.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/56064711577.pdfIn PDF document text
    • http://fgosvo.ru/files/files/2593532376.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/jaxuzabinoz.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/95695840996.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/62151702098.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_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 10340 bytes
SHA-256: caa451ba140c6816db7b5c1cc9abd4ef5b1e471fbd79414877569e63513b443f
font_02_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 17856 bytes
SHA-256: 0065cf33f97607b5046f2b17815deb2782dc6e6b7fa25cd36b76459554abc8f3

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