Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acba2fcac1b38bf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-25 10:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 47e910356f6209f73d882c353d818104 SHA-1: 7b05237ba1399394f97dc2e249516438d4bd6b2e SHA-256: 7acba2fcac1b38bf59eca753d8ae4bbca50d19bb7b2753a13e376403d29aa53d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a likely phishing or link-farming scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://philabc.ru/uplcv?utm_term=skinny+cheat+in+gta+san+andreas PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330437a1a40---nebipodamebefezorarojif.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109160920126273.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/59541727201.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/98080731584.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tifujarekododuf.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/64394001623.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/sikeduge.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/41083816197.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/254824696.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/lopav.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/61765104149.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/51713901482.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wirogaj.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/mewoxetazev.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/93360403503.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21e700420---satupitakunutevo.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/73528027715.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/93059102933.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/gowik.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jewedarumuwabo.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/kofelofulusomujobigebo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/modatopafixejekesep.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/kabojav.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/49039634630.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210906_042422.pdfIn PDF document text
    • http://ktcz.eu/files/files/kevatusitafizufatetufisu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140c1cc50d64---51223488983.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/4237918556.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_off0000bd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3D 10764 bytes
SHA-256: 9bd358ee1f7823b394d757e31141680a17e919630bf01276c1186bef3bbc4936
font_01_sfnt_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 19500 bytes
SHA-256: edce02d893dc6718e56d106ddd850f8023c5b555eac735fb8aa63a0b3027859b