Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2646ba7ee11def3…

MALICIOUS

PDF

140.6 KB Created: 2021-09-12 19:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d06ba9db88dbe08e38b9925020cd48ed SHA-1: 99ccd163219b6f71f2ede77b68a9fc38464e37c7 SHA-256: c2646ba7ee11def3480f0bca6232364e71d57c3a4b2225bba634524af7e1efa4
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting it acts as a lure to redirect users to potentially malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document for containing a large number of links on disposable hosting, reinforcing the phishing or spamming nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22434021126.pdf In PDF document text
    • http://bandenplaats.nl/cmsimages/file/vavafa.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/kisasazawavifawotisozaza.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613486b0d19fe---lofonunabijoto.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/litodipuwalijekulofubowaz.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902142441.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8a24221820c8e396c20a4bb383814f5a/gumijijixinuvogatusopete.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/97582026211.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/vuzogevokojalimedetelinud.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/tipamivevoxokewitiwofofi.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/72606373756.pdfIn PDF document text
    • http://orenprom.com/img/account/file/52867714362.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/tegobujave.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/fasipotuxibogeje.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/61630893386.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219295025304.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/nibokidekigerix.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/milapuguso.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/xizafe.pdfIn PDF document text
    • http://topp.pl/_topp/file/26778919374.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/50960623129.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/sawogenewadi.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34566234118.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/wedisodovuwawiwotunibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=redmi+note+3+flash+file+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_off0001be09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE09 20768 bytes
SHA-256: d5a94c9d1f3963646431e046505c6ef469e1cd45051e019da03b487f8a6263cd
font_01_sfnt_off0001f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E8 10820 bytes
SHA-256: ac7d36ee1aac5bf7f61074f4006267ef583e5a5418a1e34dcd0c2a694728204f
font_02_sfnt_off00020cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1