Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5c316721218cd2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 18:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9dcbf7025269ee630ce49b41a5daf635 SHA-1: 3e16423aabe9887acd9d79e8f442ccf9a59b2172 SHA-256: 1c5c316721218cd2ddfbb4470907352575a01903f8ff70dccd0989a08588c451
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URIs, with one identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://s-serviss.lv/userfiles/file/nevuvabugevigabowife.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613625a9de1e3---fubasovivusag.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/vulitu.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/runukewubofovamizurode.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210912202643.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/64377208709.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/lifanugidedakusirazazigiw.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wutitasaxifopabulitoruwef.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/gutipuvotomar.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/rarubalisunumuwepakifir.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0857936001630513757.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/totolawud.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/37976004754.pdfIn PDF document text
    • https://yasacompany.com/upload/files/15855309699.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210909_125344.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/64434176600.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/gotutife.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/50505509873.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/93232390015.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/84964410377.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/58563706375.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/72538152474.pdfIn PDF document text
    • http://zimmerei-possert.at/bogifunemiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=state+survival+modPDF 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 10544 bytes
SHA-256: a995e7648a07e813467f275f50007d626e0e84898ae5dc2d82a4f26ffa08994c
font_02_sfnt_off0001012e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 18252 bytes
SHA-256: 5551e014c2590545e31966c5c024df1e44c5e4038ea10cbb5298a384df3411c4