Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff613b2197d7496…

MALICIOUS

PDF

69.1 KB Created: 2021-09-24 20:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0e830505d08dc200ade85911b0ad89d8 SHA-1: 7987dc0551c89ce59de33779a8b1e0b16faf77df SHA-256: dff613b2197d749626e471230a64d867f8fb51fa94c4b8539b79042b0a1e7a03
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded JavaScript likely facilitates the download or execution of a secondary payload, while the link farm structure is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://pistant.ru/uplcv?utm_term=force+close+app+on+firestick PDF link annotation
    • https://ardiinerkh.mn/uploads/userfiles/files/wuwab.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/62588659663.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/79026633783.pdfIn PDF document text
    • https://kokomanis.com/contents/files/peliroralovuzanixonamimis.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130377c0f0b9---poxasosum.pdfIn PDF document text
    • https://bloc-immo.com/images/83479806972.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diluwufiwogomi.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/bugonedenuviporinivuvuk.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/mesozisaw.pdfIn PDF document text
    • http://geoman.cz/data/file/51247413596.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/20652000082.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/webuveburutud.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/vigewewevomezewilom.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tiwizenozadefaza.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/jiraxu.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/pukigem.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/757cb5721a3d8a85eb20ccc662b6611a/mexefaru.pdfIn PDF document text
    • https://theurbanthinktank.com/files/peken.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/70747977115.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/30398985025.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/85606653275.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/78998485852.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/xizovigig.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/pukip.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_off0000afed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFED 10544 bytes
SHA-256: 558783a5acf1a5eb204b738c7b1faa32ae1bf2e7882692b53a0cdbde156a9351
font_01_sfnt_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 15292 bytes
SHA-256: c40123e3f52567bd0a3e82a658eedc2230e4d7c7c8714a4f3f3d9e3b04f1982d
font_02_sfnt_off0000eefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1