Malicious PDF — malware analysis report

Static analysis result for SHA-256 7548ee1af863510f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: deeebcc3d93888da2b1d24783ee03b41 SHA-1: 384331952ac179db26e06ce5c60fdeb34feec6c2 SHA-256: 7548ee1af863510f56e2c0c77dfb2557c8c9c2fc050d4cb6b36dad565ea35594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV detected this as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://inwebjor.ru/uplcv?utm_term=fifa+soccer+offline+apk+download PDF link annotation
    • http://seattlebestteriyaki.com/uploads/files/44983362084.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/rivovan.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xukew.pdfIn PDF document text
    • http://schokozentrale.de/idata/kopowobop.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/fabozeduvijize.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/dugenasipu.pdfIn PDF document text
    • http://videlec.be/ressource/file/zizosurabosoradolebo.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rofusedamev.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/todirabojimalovatawewole.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/dodekowuxazolex.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/tisub.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/54228001616.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/winipowobuxunam.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/liwap.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e192810ee---42241387438.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/83212806878.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/9391968004.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/renededupufipoxitosured.pdfIn PDF document text
    • https://banghenails.com/upload/file/dedamaw.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/lenekokof.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613161a3245f4---62104621009.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/pekukilaximiwokog.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/89179640923.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210904065303.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/64286119709.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_off0000bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B0 10668 bytes
SHA-256: 3c247a94efb82738f73e37463d757a9c8b2dcb3baaec59a25933d58b1ef15b0f
font_02_sfnt_off0000ec3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3C 16356 bytes
SHA-256: 0e98a49e9edf563ca6c5cd5581c57775680d0ee65fe6b06d76d74d2460c363b4

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