Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a07c7f80dc19e9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 23:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78973ea06cab3fecde9484afc9da8422 SHA-1: 988755585de39258aafc020edaf32365a309a26f SHA-256: b4a07c7f80dc19e9913d4e46f96b2b454168b9084982cf9b3d8055b76c2b8173
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The presence of embedded JavaScript points to T1059.007, and the overall nature of the document as a potential lure suggests T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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
  • 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://crysiq.ru/uplcv?utm_term=windows+10+single+language+iso PDF link annotation
    • https://rocksoliddesigns.biz/userfiles/file/mutitejozukidoduwutuw.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/xaronop.pdfIn PDF document text
    • http://briztravel.com/upload/files/59093741271.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/nazoramibovefuxidux.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/93312296435.pdfIn PDF document text
    • https://badrivishal.com/media/befavab.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/vezovuvoletepuperavafo.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/98128815993.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/68526713283.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/16869408132.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/nibegisotilubodolamabuse.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131879449cd4---zimazobetagoxi.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/84059817224.pdfIn PDF document text
    • http://altinay-law.com/images/file/bekutuzikidob.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/90936394402.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/13029794953.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/39849242734.pdfIn PDF document text
    • http://sbcnepal.com/images/file/vesoxawasulaneru.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/rarunewosova.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/nulojosujovuxewukibix.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/71183942282.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/53554585501.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5669294a5ff68997b082952f0fec2ac4/44417412293.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/27790342312.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/zavuwajakerilop.pdfIn PDF document text
    • http://ge-mak.com/files/55123901153.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://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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 10580 bytes
SHA-256: c4a22d601bf0c3e6f6b24215f2d9f4e79c43a7ad92d4c63aee677844ddce92d3
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 17852 bytes
SHA-256: 0fdb8e1bcf81d7ec690631f631a3a2b41faf46f8cd455bae18fa47388fb31367

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