Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e8f93ab063f054…

MALICIOUS

PDF

86.0 KB Created: 2021-09-23 03:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a66bb62678ab4302e1cb64ac7ebb5c3e SHA-1: d792bd62538aaad6198cdd0893dc615328a1f53a SHA-256: 10e8f93ab063f054eb21183f24e148fb8c900f8cf6505e8b12dbdd5d2a9f7a8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=average+rate+of+change+of+quadratic+function PDF link annotation
    • http://japanbizkorea.com/userData/ebizro_board/file/92142000574.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/boratarafesasuguli.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/rizidajazonunola.pdfIn PDF document text
    • https://wiltech-hk.com/editor_upload/file/91537444719.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210905_091303.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/tufakekilopokabalorazo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614900857391b---loboxijojoworebave.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farevij.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/51845889772.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/mapinimufubuwatefiz.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/59599850870.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/nizug.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/napudi.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/48822738254.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/6463810171.pdfIn PDF document text
    • https://tigapilar.com/upload/files/36517797547.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/66572168038.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/zubamuliputuzexejorogomal.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/weketuwofowes.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109070620006298.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_off0000e926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 18748 bytes
SHA-256: 707251dd4b14d3857ba336977494073a1c343fbdd1e9cdbd5e76702c7e18da32
font_01_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 10836 bytes
SHA-256: 4b9ac169570231d833f8cc78f681e956705cb9a4c80e49a167d41353ccc6c305
font_02_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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