Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7785b2d84c7d1a…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 16:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84de126334023f968014382cd9cfd1d2 SHA-1: bc199d496b3ac387738486444756593d16b1cd28 SHA-256: 2e7785b2d84c7d1a56f0b67792eccb45fac7237869d1fbbdfbf5a9aad876a384
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a large number of links, potentially for SEO manipulation or to redirect users to malicious sites. While no scripts were extracted, the presence of numerous unknown URLs points towards a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://koszyczarek.pl/userfiles/file/11003502073.pdf In PDF document text
    • https://maisonforville.be/documents/file/96875447108.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/gapefuzizosivexabapan.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/62136690712.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/15084952121.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/29656784251.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/wokevoxesomerefuve.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73379907907.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/93424450073.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/borad.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/guroleworizon.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/1817949390.pdfIn PDF document text
    • http://entrackintl.com/uploads/sibexogarakidup.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613421a43a1cf---86314983428.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/31054979828.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/88873799445.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/44436042192.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/43573532273.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/75263207847.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/tamusugedatezowiferupon.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/xasolagomipifonu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ced93cab0f---93186631531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=4+pics+1+word+free+download+apkPDF 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 10728 bytes
SHA-256: 6d324423258a14b50af75f5cf0305bea32b2008d0e2e067711676cc2e0130014
font_01_sfnt_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 16588 bytes
SHA-256: 51549c50f859e207ec1b331b55d8fee6785687ea8b9d6331e6e487fbbdf7310b
font_02_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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