Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edd82e5e47c51bf…

MALICIOUS

PDF

90.8 KB Created: 2021-10-12 16:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6925ccccba736fa29f063b4d804e848a SHA-1: b18561fcf6db469a85403f8a6e8f505f60e7b3d1 SHA-256: 9edd82e5e47c51bf35f30e21ad137ae279dc05b7d1d6ecaf41b2800914c07ddc
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 resources, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a link farm on disposable hosting, a common tactic for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://lagostena.it/userfiles/files/fokexararu.pdf In PDF document text
    • http://ingpiazza.eu/userfiles/files/23913631033.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060712002615.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/73231910268.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/vuletofitotujibiwofa.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/12378743345.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/51ceoq1795er7vqdu1pihbljiu/51321373069.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/dapudusevojaxuf.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615db41ba8909---15038324124.pdfIn PDF document text
    • http://winso.tw/userfiles/file/binemigopedenepaxakonid.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/zigojiduwigezubomej.pdfIn PDF document text
    • http://espace.peinard.fr/include/images/files/56841791728.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/30129978432.pdfIn PDF document text
    • https://novsport.com/content/File/23821993451.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/2109102148310202428xvp2.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/2m9rejd2bg442uq93mahrn652u/22175423815.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/robudalu.pdfIn PDF document text
    • http://tradotel-riviera.com/file/dozeduvuwa.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/tejedad.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/61277003763.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/mugixibe.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/50071180021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=sharp+tight+pain+in+stomachPDF 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_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 19172 bytes
SHA-256: 1a58e0d6ceeff3941af7a87cc54f128d1919ffd18acea6014d506c9da1c334a0
font_01_sfnt_off00012d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D36 10716 bytes
SHA-256: e06b44faad82d08f8231361290f087e5bff0247854504e57c3e960e2e833469b
font_02_sfnt_off000145a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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