Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f5902914699ac3…

MALICIOUS

PDF

67.5 KB Created: 2021-09-25 14:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3deee886218d36c05e67dcee86483a5 SHA-1: 6f00ffa987098b750a1146d0e88664f7eac42ff3 SHA-256: e7f5902914699ac337c324daf08057cc93360dc6d3c159856860c2996731ff01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or unknown domains. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zbmbudomont.pl/userfiles/file/23933890298.pdf In PDF document text
    • https://hotelharmika.com/assets/userfiles/files/57048550222.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/53310836556.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/nekedobixinanofakez.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/nikoxaxupa.pdfIn PDF document text
    • http://kmimmigrationlaw.com/userfiles/file/54285371064.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/22660082951.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/vufimulosaw.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/berinerifujadet.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210913110139.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/51401100604.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/wedevokexofuk.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/97567892004.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49588633859.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/78269383937.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/83691006052.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64319244268.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87165710593.pdfIn PDF document text
    • http://posuni.com/userfiles/file/damewuwerug.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/lixuwilosazinazitegisoke.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tudilusodesigovejik.pdfIn PDF document text
    • https://best-label.com/upload/files/33445275639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=friends+the+reunion+online+cuevanaPDF 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_off0000ab4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 14896 bytes
SHA-256: 7a6f2dec1a7ae5c23be495e65afb61247e162a38d8bd2f7cab0e898dae4d46f1
font_02_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 10608 bytes
SHA-256: e6e94e61796c1acf46417305c17a546584deddbd23e91d676e4ead9ae1cff9d6

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