Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efc838d13da8ed1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 10:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9bc4da50c1c77e83c34018ec3e02cba SHA-1: 6ece55efdf665897b4ba3d2e922711fc0dfbe8f9 SHA-256: 3efc838d13da8ed14d76f4b424f350fc33a9e8cf3d40fef9e5d828b991b58fad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to potentially disposable hosting, indicating a link farm designed to redirect users. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gagebobekodos.pdf In PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/gobepinivobifisadove.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23670958891.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/49569090073.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/78670929139.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/54849849427.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/zimebizuz.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/61762785871.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/bezuj.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/10171681721.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/migexobesalodugikizig.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/60806001527.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/jivonikikefejudovi.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fugunelaruwogi.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/larepageneniborixawuwo.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/34695357015.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ponazegakebanujapuxax.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/23070563384.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/68996170186.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ad561e0fc---fufuwinepitipozimajo.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/9689748344.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/kugozu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131d525bbdb0---rebetizut.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383b0b824c0---nozasujelunarewajofofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hill+climb+racing+hack+ios+downloadPDF 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_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 15056 bytes
SHA-256: edb163f850e01f32aa0853daa14d44a391f084e7acef99fab5ad53ca540fa549
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 10896 bytes
SHA-256: 3ae2f01243cb71bd09920c305671502d3d050477b1c60f3ad20da4ab5d6d0e65
font_02_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1