Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1a12856e76c35d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 08:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 80cc33bf5badade80a0636428a7528dc SHA-1: 380a4d2b99955c68ab59e0e8fa594d6826fcf029 SHA-256: fd1a12856e76c35d03e1ed211cd34d54107822192e6e037bb9139f81cabead40
166 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a link to an algorithmically generated URL and being part of a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an intent to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/83291553127.pdf In PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/53562589561.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/6041888670.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zuxovan.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/82680386204.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/temekakudanajofup.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/terujuteje.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/29261750338.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614fcad1a0fb1---bikafowevobazeluwumufiza.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/9376931595.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/33369657426.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/16176315583.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/93854878359.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/55073930500.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tavowuwumezedijem.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/23355995244.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091313010473499.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///43059314167.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/70501290605.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/15330313282.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/46823554296.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/pepibef.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/ruxag.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/vupuzapudinotopik.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70697242696.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/lofesefebakazitidibuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=xiaomi+mi+11+lite+5g+antutu+scorePDF 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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 16708 bytes
SHA-256: 0005a62e941f4a5f153b7826af467525dee0a9f1be8ec7e021d98ac9112b13fa
font_02_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 10868 bytes
SHA-256: 4c9d6847ccf50a33eb1a94da1020b5272f46407caf6e49cb89133205c736198f