Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f599e65c99b6d2c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 23:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c3fbf6696b204104c43b7e55244682d SHA-1: cb2d37d0ebb8f426502258a9ca620a6ecf910a6b SHA-256: 2f599e65c99b6d2cf7ef2e1219d1f7834c824bc579d0f4c1852fc3d86bd328c7
166 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to external resources, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded JavaScript, though not directly executable in this context, is often used in malicious PDFs to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681e0a2998---webinigofipasujukuwejode.pdf
    • https://aspit.ro/imagini_ws/70576061609.pdf
    • https://partetesal.ir/data/file/ninodejuzixasa.pdf
    • http://lnhaihui.com/userfiles/file/20210917113412_542719878.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67380156827.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/gegamexerujugekurarale.pdf
    • https://flardochform.se/userfiles/file/59888477392.pdf
    • http://jjc-dev.com/userfiles/file/45093602474.pdf
    • https://niboparis.com/upload/fckeditor/files/rujibazapexonubir.pdf
    • http://thainightjob.com/ckfinder/userfiles/files/17626997951.pdf
    • http://guitarenko.fr/img/files/runedadozojijonunovi.pdf
    • http://juentai.com/userfiles/files/33043478735.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/89753914676.pdf
    • http://wx-test.com/upload/ckimg/files/202109121111215016.pdf
    • http://modulobase.com/userfiles/file/14195844218.pdf
    • https://aptitudeclass.com/ckfinder/userfiles/files/donaxisuwovavuviwad.pdf
    • https://safrano.pl/userfiles/file/pawuxajolame.pdf
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/13042968637.pdf
    • http://evo-models.com/uploads/userfiles/files/terodipizupez.pdf
    • http://baigeleather.com/userfiles/file/figixefupamojovodefok.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/53435127842.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614342c2d5e40---baxenokob.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/41121140773.pdf
    • https://travelworld.ro/userfiles/file/wujupuvumijivalubifapuvu.pdf
    • https://netwindowvn.com/uploads/userfiles/file/mesovalitisinavorigugas.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=doraemon+game+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b1.bin
130cec72e72d3d1103bdc3cbf0911be532d506e0712f0fb81d98254368d750c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B1 10424 bytes
font_01_sfnt_off0000ea05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16792 bytes
font_02_sfnt_off00010217.bin
8d4c3503c80c5014ce047de6d8147c0e085cd7abee4abb8b9906854eaea17430
pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 17752 bytes