Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e2fec044359185…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 01:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39f25ceab87f0fd9832ba4dd8b90d777 SHA-1: d5b45fba6784f8e0a80feb6f7c27d1fd4a5bb228 SHA-256: a0e2fec0443591854fba69bc5a704b562a5b7627b97c937800334accda88943a
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 a large number of embedded links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://adhunikjewellers.com/ckfinder/userfiles/files/nukadikekoteveb.pdf In PDF document text
    • http://fittbikese.hu/files/file/91958141159.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/fijokulotu.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/wowobunojo.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/26152009260.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fefb2d9581ae558898d03fecee280e62/23985935764.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/gejifejazebeputugezizime.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/84539204868.pdfIn PDF document text
    • https://mmtours.si/uploads/83039123715.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/23167268580.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/kenavodamifimepubuwuwe.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79622427920.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/35596623835.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/39878941477.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/xitilunukiverigi.pdfIn PDF document text
    • http://unseretochter.com/images/file/varuveliripiraxesevu.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/57018469207.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/fimixarotelijejikilaruwop.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/kabatefezetabegetufazofa.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/73996391201.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/27139890210.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/33313819104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=tamil+bible+apkPDF 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_off0000b049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB049 17180 bytes
SHA-256: 9c8cc30213f01e8b19ec736140cdee1130eb81e27357320403cfd3f2535b4474
font_01_sfnt_off0000dc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC82 10016 bytes
SHA-256: e9235b47d140d6ee0fe51ed08fdc8ffa837e8e73c40ef4bb252e87840c57b9c6
font_02_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1