Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8db1b5b96bc7ac3…

MALICIOUS

PDF

88.8 KB Created: 2021-09-21 13:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d1e8b6c59e91b589b78170436384368 SHA-1: dbe2fd0198c0d3ec4be40ddb62d139ebd9347639 SHA-256: f8db1b5b96bc7ac30820e0ef542b4259e54777c8ad6b7e43ceea97cf47bcaa8f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it is designed to lure users to malicious sites or download further payloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous disposable domains for hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=sat+exam+math+pdf PDF link annotation
    • https://heuresromantiques.com/upload/files/wikamo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/dd1c09bd57271b56d7668dbcd5e56284/21529477855.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/1355984252.pdfIn PDF document text
    • https://viceda.com/userfiles/file/xukegivalem.pdfIn PDF document text
    • https://medpressa.ru/files/file/merekibademekuzigumus.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/66596421910.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/gifolidevi.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/bujofagufenibo.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/34843135604.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/zezojewisabikesogut.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/radap.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/73534617257.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/86904862707.pdfIn PDF document text
    • http://darec.sk/files/files/leviberiji.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/beguvogevelewev.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/15901704998.pdfIn PDF document text
    • https://ienter.bg/files/21274185713.pdfIn PDF document text
    • https://kawanmto.com/contents/files/toroladununugefixap.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/jegabevum.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/69494808421.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/65478490738.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vifigafile.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/61726434588.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_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10312 bytes
SHA-256: c17815b5ba93e8ee7ddd20e93b94f0069e84b903cf35a2b8bef007dd80375585
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 19896 bytes
SHA-256: e1523675f7dbcf5b45856ace1fe0d648c3147b72125dad4449c44d1805355a92

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