Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d1814874a559a23…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 17:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91fbd558bc328015d84eb1c66b20bb6c SHA-1: 7a6f37e095b16d034374485cc912c994e69e6bd2 SHA-256: 9d1814874a559a2349fe44be935cca083a37880cb66a9a49b3d87fc6bd3bfc03
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the presence of numerous external URLs, many with UTM parameters suggesting tracking or redirection, points towards a phishing or malware delivery infrastructure. The document's structure and embedded URLs suggest it is part of a campaign to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 https://huntic.ru/uplcv?utm_term=how+to+hack+android+phone+by+sending+a+link+2020 PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe8a2af5c---83796808832.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/fanukalabegozoxakogo.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xezulipelebibugu.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/87710948178.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/xizilijipaxalidodixut.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/rusugoperomakoga.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/38004458936.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/jariloponomegojowumiv.pdfIn PDF document text
    • https://armenia4d.com/contents/files/46517687266.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kujetaroxibuj.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/pefaxilagogisosuxowaj.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/26282721093.pdfIn PDF document text
    • https://blogsma.com/files/22544990950.pdfIn PDF document text
    • https://grandegroup.net/files/xafodilelodenubebiwo.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/mufumewikejenoladagit.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/fibonuvukazojanevaxid.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/tumovokutojerixibi.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/96087239798.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/94677676503.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/fojinuxotizigip.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/zelibowigexetazawix.pdfIn PDF document text
    • 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_off0000d39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAF 18632 bytes
SHA-256: 390b3bb4e72665ee59f70ae3f9472bce78f00811f49859a738a49e12962e5199
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 11456 bytes
SHA-256: 91381b9c171c4743dd5ea414c3aa2881fe362be6e818a7ea441b92728f172bbb