Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab0a2040db599e8…

MALICIOUS

PDF

86.3 KB Created: 2021-10-06 13:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ba130d8cbcf0efdf8cf3b30f1d4dc24d SHA-1: 95dc47e2bf911b1080ab805039fdd1cfc846930d SHA-256: 4ab0a2040db599e8d51ab2e2e190404ee6d31c08ed6c6f6eea0cb827e5cdea6d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggesting it's designed to redirect users to potentially malicious sites. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics confirm its malicious nature, with ClamAV identifying it as a phishing trojan. The embedded URLs are the primary indicators of compromise, likely leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=7ps+of+marketing+with+example PDF link annotation
    • http://dermalab.pl/userfiles/file/60631065399.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/13599245913.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/81736683723.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/kumow.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/70786627884.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/wagakekoguzafam.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kerivezimaxejosoxili.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/22436353826.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/fowuzixigavojedo.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/19824425570.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/tedibipukozevi.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/56706164822.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/torafupafarexifimar.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/46385572739.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/31024687370.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/15569044515.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/4016898775.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/85901207863.pdfIn PDF document text
    • http://tongdingjixie.com/d/files/xekajowi.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/89836085736.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/wusekevaxalunezixajok.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/zazetojubepukivisaraj.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/22086819322.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/2793998800.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_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 11040 bytes
SHA-256: ca67529f68b4c7f0c0e8194ebd9cf4353021e380d1c50a574c8cf6cc5e534a6b
font_01_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 18600 bytes
SHA-256: ec95faf95bebdc3a54aebf812b8832688e568c2022369bcb927427a20399894b

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