Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a0fa12a66812cf…

MALICIOUS

PDF

85.4 KB Created: 2021-02-26 07:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: df1ead354c87b591a8178ef1379507bb SHA-1: 7491f08bf62376937beaf132dfe05d49f02e4fd3 SHA-256: e8a0fa12a66812cfa4ae3a060e6cca72b9d9c062bbcbeebcf606b3ec34a53079
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document prompts the user to install a browser extension or update, a common social engineering tactic. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the link farm and the lure suggest it is likely a phishing or malware distribution document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://jottigo.ru/award?keyword=how+does+a+mountain+lion+adapt+to+its+environment PDF link annotation
    • https://cdn.sqhk.co/mowezeto/1hdFhgn/cartoon_cat_wallpaper_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/eIi4Eha/vovotedivibopamiwogapot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_601a4557d6aa0.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/6beeb676.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/wovezovijure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_601ca35d25df0.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ehegrhb/97557017885.pdfIn PDF document text
    • http://clubstore.pro/consumer_reports_air_purifier_20195gza4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448735/normal_6014204f730f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_602519b8e7af9.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutesilo/bFgiiwq/ballpoint_pen_meaning_in_spanish.pdfIn PDF document text
    • http://reassurez-moi-fr.info/wefbee_auto_likerb9idv.pdfIn PDF document text
    • http://forsage.pw/mejopumibatizikulizaninoz522qp.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/how_to_paint_a_room_with_a_chair_rail.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481676/normal_600f986a384cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386091/normal_5ff53894d9232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414677/normal_602a7de02944e.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/6869239.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 5216 bytes
SHA-256: 9af82779c4ed3792b609f8b878ee6202dd845a88e48177ea6f0f53c2ec7d50df
font_01_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 10476 bytes
SHA-256: e059790ee87b8a19444c64f07737914974807dbecdd11a63da6c5eb97a2b12ed

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