Malicious PDF — malware analysis report

Static analysis result for SHA-256 903860131f0df6f4…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 03:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01614aa0baebc799e86d75aae2f99603 SHA-1: a0bc9c339a55bce5a8927d3f2e7d868f0949e1f8 SHA-256: 903860131f0df6f43f4046a07b92bad1ff03429dc062ac53dc9c373f2c54a61f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL distribution suggest a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://mlmrockstars.com/ckfinder/userfiles/files/42689023166.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zavawadaxuwegakasobukeful.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/47048321099.pdfIn PDF document text
    • https://databaze-zdarma.cz/userfiles/files/88920991217.pdfIn PDF document text
    • http://bdsductri.com/upload/files/neruzapowikaziwulutafam.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/vfv4de7f7qr23ej84u9gk4bf6p/pirigulovipovasodomezugar.pdfIn PDF document text
    • http://falerisztika.hu/tmp/89062847255.pdfIn PDF document text
    • https://emprenderem.cl/files/togogijadeguwavetaj.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/45678169835.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/21860769020.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///xelidibu.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/72110563370.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/jiropuwajuwujaxev.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/38999290530.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/61685114418.pdfIn PDF document text
    • http://wjcopy.com/upload/files/81783342831.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zukufis.pdfIn PDF document text
    • http://goldmustang.ru/files/files/misabepasapasifuluvev.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/745c3afecad70edf825b07772d99b128/wudewaxudowarogub.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/fudisugosepesamodunav.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/dogifewomamazuv.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/vopepikatifap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mishima+patriotism+pdfPDF 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_off0000abf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF7 14592 bytes
SHA-256: e89d25d7939c4b4c70a9f0e228dda1e6492d6a82b3a7e9936940e8b01985d483
font_01_sfnt_off0000d05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 10476 bytes
SHA-256: 797a23eb08325854968a0a403efb52d08f33a83458080dbcf2d1549cd1311696