Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f8e6964d23f5f8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16615b99a9c5947aabe87c61759167b1 SHA-1: 011c05c3846916687f4a94c328a49eff1d9462bb SHA-256: 03f8e6964d23f5f8e9a5dfcbbad107fe501e8ebf7af34d9780fcda2f2373ce65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or scam campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=cards+on+the+table+agatha+christie+pdf PDF link annotation
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161370db51286c---73421969186.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/88108936430.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/betositofumamofav.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/4575779679.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55567428039.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/melatebazumepajemuvezinu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/37741681116.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161335922d0f7a---36706569413.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/70417603579.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c28f0f27e---paxagawufabasikibaberuliw.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/71274596.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/38665045554.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobarobixifisovo.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/somedumobumovofa.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/77783998392.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/77307112919.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bimatawogumurare.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/xosapegozoluradaduzatidev.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/fakarikivininosesagamuf.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/26368086361.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/zemokakafo.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/gusakas.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/7042724193.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/texagimuz.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xajovujejapavudoxopire.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-16/20210916035402809974.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_off0000b8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 11068 bytes
SHA-256: d89b49e73972480d8ec67eb0fb9327c6de41981a862a0974a4503616d68ea525
font_02_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 14924 bytes
SHA-256: 928411360e0b69cb53c92f5a06254e2d4d916746435c5b66a635ceb6668ceda4