Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a8e1153a883cf8…

MALICIOUS

PDF

85.8 KB Created: 2021-09-11 14:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: d6a0a073c8ddbd34a1b578180cbaa3a9 SHA-1: 86f24cb199e70ea6b7b621efd1a223e2bac89f3d SHA-256: d7a8e1153a883cf8db669c60d1581fbf6ba9e23de0e4c18406dd8eccd1d1787d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://vertracapital.com/uploads/files/10836670570.pdf In PDF document text
    • http://qdjshg.com/files/file/99439893982.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/83409211788.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/82525649266.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/meberux.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/dozepoxasuxub.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/pavijosu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/41544292654.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bifiwakanusid.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xazevedo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/61494441538.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/dakijufuvijiwew.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/82760533279.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/23281215211.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/vufigorev.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/wuxedodobavavozomisigatem.pdfIn PDF document text
    • http://myesen.life/userfiles/file/44239520209.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/walaresolibibemafijawadaw.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/49652234995.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/94591210581.pdfIn PDF document text
    • http://www.depomatrial.com/file/49837024258.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/tupovigilitosagatuxitawim.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109030255432334.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/50083345954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stream+live+apkPDF link annotation
    • 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 18596 bytes
SHA-256: 5223e698b928967e42ce6f526acf791ce1ac05a83cfba35b2d7b44996c6e85c4
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10252 bytes
SHA-256: db960c3f9edd53f29712f06611d699586ffddea67fbd716cb9e7f9ae33f9ec1e
font_02_sfnt_off000131c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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