Malicious PDF — malware analysis report

Static analysis result for SHA-256 a996a5a77ea28585…

MALICIOUS

PDF

74.3 KB Created: 2021-09-25 15:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8db2beb86fa1792f3d31eb4d85c5ab9d SHA-1: 09153119f63f1fa59714ad8fa69b42a4c132dec1 SHA-256: a996a5a77ea285855a38de284d9e18c3a4e863f2229890addeece56d4e621600
146 Risk Score

Malware Insights

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

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous external URIs, many of which are hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 74 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cincia.ro/ckfinder/userfiles/files/fivusofixox.pdf In PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7lhtmh7g2sof49pdq27c26qvn1/68102130304.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/98436308671.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210906173410.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210909214607682.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/bajadalisiralosalurupeve.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/barazesafasiburito.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/24275748978.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/18523136652.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/39842978423.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/mitugabolizububijen.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nureno.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/27506305337.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/fopinugafi.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/84484188995.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/dazavijakuzatasitaniber.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/dexemapamamozax.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109241647193126.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109051234528936.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/minuzumukedezejolokisi.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210924010340_eu3vfe.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/7115120655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+make+a+tiktok+sound+your+voicemail+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/gufosotowadiz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCF 16972 bytes
SHA-256: 277a3574a743195aeb641301385910c7a4670d94a1b1a2fb44bccde82d6d058d
font_01_sfnt_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10980 bytes
SHA-256: 9af97509cd30231e75d1101b6dbb8d892ffdcdbf7a34ab04fd5d0b6c39327f31
font_03_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 14288 bytes
SHA-256: c43767b4c8fec8e9c8482700bc7cededc1bb0612fbdb698321ee88a63eefed0e