Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb396553eb6ac1be…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 03:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d905aa180ace3c8c22ea67f9a339dab SHA-1: 1398fc1d1a0cda451da3beb28886b33580d91330 SHA-256: eb396553eb6ac1bed23bd117f8642a034fd024027cfefbe3d44b5e4e179c4057
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://asqcert.net/files/files/kotitimokavojile.pdf In PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/66642788364.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/96229182994.pdfIn PDF document text
    • http://adice-area.com/pictures/files/43194162519.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xisusifuzufup.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/12187847238.pdfIn PDF document text
    • https://stvorki.ru/files/file/kinutigijukilezaliwiwujid.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/10352161014.pdfIn PDF document text
    • http://bociany.sk/media/file/62628325885.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/28222171961.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614836dd65922---10241955382.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/bemexajerazajemit.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/ruwimegixix.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bifugegobu.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/wugasevom.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/2098954266613321c22dfd3.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/dozawuzozaxorazo.pdfIn PDF document text
    • http://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xesibonizig.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/zituzuke.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161310b6f24a59---vofusosepad.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/rekulapapevekejul.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/77057233983.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/18177280642.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/wuzinatiwepifiboxonuna.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/6261816603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=where+to+find+developer+settings+androidPDF 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_off0000b45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 10836 bytes
SHA-256: e8f125680a5213d9711045c1171935db6a1f62f57f0a74e6fb610c82c8cbb763
font_02_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 15944 bytes
SHA-256: 9819f8e26fde69bf71a1629c06d873b184b1589e9020c84e664952edb7dbe109

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