Malicious PDF — malware analysis report

Static analysis result for SHA-256 29289fd23d89e81c…

MALICIOUS

PDF

86.5 KB Created: 2021-09-21 02:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1d613cb8af530a2f01b2d94a5123e346 SHA-1: 1fdabf4c2bb846775abc8d61a6c59691f10f8310 SHA-256: 29289fd23d89e81c30b9e1270fd1cc97d725ffbf17ac43c819accd1a709bac82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to external PDF files, suggesting it's part of a campaign to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mashhadgardi724.ir/basefile/mashhadgardi724/files/buvadixuleb.pdf In PDF document text
    • https://kettosallampolgarsag.net/imagini_ws/69402886305.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/sogufokixuso.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xesumiwigutitaxaxe.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/dipuja.pdfIn PDF document text
    • http://rococosofa.com/files/files/mebupewikejikujeremilufa.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/wawugaviza.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/waromefax.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/nejaxobijolufimiforutemif.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/27101998166.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/21403754166.pdfIn PDF document text
    • http://888chji.com/userfiles/files/45543167946.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/73307694678.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/45334149911.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wirokutetid.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/zawiruwixakobozafu.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/31712665558.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/zevelizemazowedurowili.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6a33b2741fd80fa76a87f94426185e8c/14410639753.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/waduxetuxuzanefazog.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52735032947.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/befozekupe.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/56605498122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=top+5+upcoming+truck+simulator+games+for+androidPDF 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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16992 bytes
SHA-256: bd4c22b910cba8d0e9f59f38f0596c2fec6c10d7bc274a325e65f7d4c79a3a5d
font_01_sfnt_off000119af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 11252 bytes
SHA-256: 0e80be9953d2da3c2dd7f956070789a5230e0aedd704cb9cc449951e1b02cafe
font_02_sfnt_off000133f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1