Malicious PDF — malware analysis report

Static analysis result for SHA-256 3717eae98b1dbe2b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 11:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b661ec9e7ef8ef174eef24abd9b7fe48 SHA-1: 55a622c55acfc40377a8bc99e8a7112141aa030d SHA-256: 3717eae98b1dbe2b7bbdb3e2cd2591ab18528989f40f46393618d472da9dfc66
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious or disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to drive traffic to external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nepalonetours.com/userfiles/files/5113839980.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/44014682934.pdfIn PDF document text
    • http://vit-physio.de/file/vurizerimovip.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde41824fd---rejotoribexojegizunur.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/vadoxupaxiximoro.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/lozipix.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/62887329335.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/69907315838.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/pepiwujup.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/sivanuxuzibolizezob.pdfIn PDF document text
    • http://a-pluset.com/userfiles/97953434294.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161367ee03151e---webegijuje.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/95481467532.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/lopuvelosolovabefumawodug.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/fiwedo.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/47419703149.pdfIn PDF document text
    • http://dgjst.com/upfile/file/zinibixuzevudo.pdfIn PDF document text
    • http://dsagco.com/Upload/file/kediwoxajumadofal.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/repaw.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/dilawalakodumeluxinewabek.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/pogitanosuwafos.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/bukobugujoneluvejiz.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210907150025.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/selofidosewuvunurev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=carrom+board+hack+mod+apk+downloadPDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 10640 bytes
SHA-256: f38bbb0de8768d2c9fc51b19a7fc35f8422e438f266b8c607b0cb5aa518ffb41
font_01_sfnt_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 16552 bytes
SHA-256: fe50ac7f1b97e65a5c00bc6aa9ce0d86d9274f875eeb9b1f65e4a9bc934534c9