Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0ae7446608bb40…

MALICIOUS

PDF

77.5 KB Created: 2021-10-02 16:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 28e4c63c9dc14b29a39557f20921b868 SHA-1: dff47524833eeefc0a0265362c325db4f77da3e1 SHA-256: 6f0ae7446608bb40a6c8b39323e35ab13f3d622f12c1d072cf3a985dbc288f15
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads across multiple sites. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ilturismoinitalia.it/userfiles/files/60130471057.pdf In PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/52372683834.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/56369857767.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/29598227800.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/29897188795.pdfIn PDF document text
    • http://generoussecurity.com/uploads/lajiraf.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/41435748199.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/a73ef7749f04a2974c22ead2cecfa908.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/fufawuzitegi.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/37040770907.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109300852107203.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/rozenukuwozixu.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/63808537533.pdfIn PDF document text
    • http://ccadl.com/files/20210913095247.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/busifaxomavetigekuwo.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109081936097242.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/jimegomalimedan.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/pixoluratebiterus.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/tibiwikekezid.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/birodizojiwasawixu.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/37283872633.pdfIn PDF document text
    • http://kechengchem.com/upload/files/66597115604.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/xajawepulubumiw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161446428345f4---35223403853.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/titijajasa.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pigiweze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=rolling+pin+wirecutterPDF 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_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 10448 bytes
SHA-256: 5228b1082a1e8e611213e96d9e824e497ece9b1ac5100eb415d9e2f223d37fac
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 20304 bytes
SHA-256: 8060eeedb7de1a7ff2f4f731f6a34f8ff3f7a60e76353ec3af88ba8633716e21
font_02_sfnt_off00010ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1