Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c016c92595451b…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 06:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a06032c42c6d60af16cc83d53c4a0b6f SHA-1: 25e75a6da6b0f31db2aa8c4abfcf11252d5c3578 SHA-256: 50c016c92595451befe0ecdfd69d34d345fe38c5af11fed46bfb0d8a76b809fc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs are consistent with techniques used to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://synerhu.ru/uplcv?utm_term=smash+hit+mod PDF link annotation
    • https://amoslodge10.org/ckfinder/userfiles/files/defenilizaroguzagaxigar.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907180044223.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161337ea6ef7d2---29976934526.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/53922476657.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/60539127782.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/kizejoxogigatitifovapise.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/18163323924.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/38389292992.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/23079749156.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/virowodewusigot.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81648113356.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wifokevufon.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/10447965383.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/94268022974.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/24822659310.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/82561569407.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/2fba282ff9c463bce20ccd6e5cfd7835/movozofazaxorizuvukupefu.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nofisobofa.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/78444038636.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/senigawexuxabaga.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/79292116610.pdfIn PDF document text
    • https://ewt.cz/res/file/ronazemavonomokoxalize.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210910_6A48E2012871FE58.pdfIn PDF document text
    • http://goldia.cz/data/file/82868390366.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///fomovetiboguraw.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/vefowikerefiwarazenobezu.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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 17956 bytes
SHA-256: 8a3437385f414a84b1996972d2787cedd521a114e13234b026b34a4296e8cf9a
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 10204 bytes
SHA-256: 77092cb40bf95ea43c9f598dd7fa032889a0f5c5b11024f55420a074c518a1ff