Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ee1402722ad17b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 01:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4188a2407b03fb49ba21fb5701f82548 SHA-1: f45f27519c67e4ac31492aa4553e9dae09ca91fa SHA-256: f0ee1402722ad17bb74b4d8aed94cb114d5c224953ba729529a621a2348b841b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports the phishing pretext. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it may exploit vulnerabilities or redirect users to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=format+redmi+9a PDF link annotation
    • https://stradatextiles.com/upload/ckfinder/files/98491427506.pdfIn PDF document text
    • https://clubon.top/uploads/files/nogusobil.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/70930964100.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/bupurigeni.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/masosudular.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210917035047.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/59273593130.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/22469612400.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/zamavufawupokako.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/zasurikiwaxujugikiginifa.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/wilebizedekibolevugo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/gufugajopuru.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/14020435627.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b857ef52---mezodiruvafutulumuram.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/74974563458.pdfIn PDF document text
    • https://gangnampools.com/contents/files/nilododadasijixudekedux.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/1894998109.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/43620385815.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/zexuzidu.pdfIn PDF document text
    • https://maturana.cl/upload/file/mopezezuximuka.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/15986338269.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfb354507---21259456246.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/nowuduf.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/31468684346.pdfIn PDF document text
    • http://juicy-group.com/editor_upload_image/file/79955503955.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.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_off0000b661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB661 17752 bytes
SHA-256: e69aa16e17cac3ea823be1344adb9d77cf542cf18fe8cfcc8ea51e2e50ff5723
font_01_sfnt_off0000e3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B5 10236 bytes
SHA-256: 4fe597bc519ad040c32c978729f01c3f0b4127100b9a4563acbb830dfd731d76
font_02_sfnt_off0000fab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1