Malicious PDF — malware analysis report

Static analysis result for SHA-256 39baef61525c7e96…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 13:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e972e24cfde5b2faef4e0fc5d4532396 SHA-1: afeb2bbeceaf888cf57834f4f6284a2d7d81e2c9 SHA-256: 39baef61525c7e9607d334fea3c2fde9e9aaaf7f7b32319fd41cd5f78683c69f
166 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a phishing or link-farming operation. It contains a high number of external links, with many pointing to disposable domains and exhibiting characteristics of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mgtofubbq.com/uploads/files/79247742383.pdf In PDF document text
    • http://solo-reisen.com/media/images/file/94943752677.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/boxix.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/59870391489.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/zifux.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a66bb7565---zefipaxo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/buvalaxibed.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/dobofujijanufok.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gagabidisalasilidusadawe.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/woxexujatezovoliduj.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/lewewefupebuzasabopobew.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/84943244312.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/38097099945.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/28791935016.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/diwipi.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomubejabuzaver.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/nifolideturobanos.pdfIn PDF document text
    • http://ore-processing.ru/d/files/29292076487.pdfIn PDF document text
    • http://altus.pl/userfiles/file/30946249214.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tuvid.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614700284e200---powalegavulanib.pdfIn PDF document text
    • https://slotpt2.com/contents/files/52020502807.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/47169649068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kotlin+custom+dialog+examplePDF 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_off0000bdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDA 10952 bytes
SHA-256: f95580d35edcc47556006586674bcb782de3771fe4700c8c74bcab040b4fc288
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 16544 bytes
SHA-256: 6baca164b53796006374a761d7d6e4c5e2a8fb280675896c04c8ff3cfff1dee4
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1