Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac7482816966cdd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 22:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fab4022be9eac2b54e833b8f436b1c4 SHA-1: 6d88529fe48a41e293fb7a0d3c58fbe4e7de5f24 SHA-256: eac7482816966cddbcdb2eab71f2159a755631be8d7023c89314e7f5ee0870c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, a common tactic for phishing campaigns. The document body is heavily obfuscated and likely contains further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sattosushi.com/uploads/files/51155753521.pdf In PDF document text
    • http://foto-preiss.at/upload_files/files/tinigifetiz.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-2/20210902135750628352.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/veneganufozivatavopore.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/sizagotuzulipimememug.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/95101185618.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161382523295a0---zesurodafewarelojeg.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/14556820527.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/lepeminisibemani.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/wazubikakozezanitudujolu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16138be6558dda---mosumomawun.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/vufiguxesumolakar.pdfIn PDF document text
    • https://5udua.com/contents/files/7979327585.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/97345466420.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/72005562220.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/nugabuguviwikarivul.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/10562583973.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69629324898.pdfIn PDF document text
    • http://446888.top/userfiles/file/36117070797.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/13424821702.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_A64B72BCD7133719.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/90911116665.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/lurosunizozezi.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/25287950700.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/62048087344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=the+kissing+booth+2018+full+moviePDF 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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 11264 bytes
SHA-256: 9f0083985458849d47a594776f24fd7205c727a73c1239e5a6c48ebe99e4f8cf
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 17264 bytes
SHA-256: da273c69e2fbeec64768a31d2dd851c55e94d1bc7b7c8a863ed9a2cf489a8c3e