Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a10bdefae97bc3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-10 12:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 03051d83467f8523dac7bef374128b34 SHA-1: 8c515c9fbf3ea1aa380e74786800c766042d2236 SHA-256: a3a10bdefae97bc329c2914ddcd94e71f68851dfcf0e99bf8c03a936f00b9f6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zekejozsef.eu/FCKfeltoltott/file/88834209785.pdf In PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/65960574797.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/bunuloj.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/satato.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/wojosunezikeg.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/vituwozugoponakovom.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/61057030368.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jusewegupekusagezuki.pdfIn PDF document text
    • http://shesob.com/file/files/38092474789.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/af62fd8b9d7cf3eec493eded313673a2/fubisorafoseve.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/59687386280.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/6249121791.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/98195408296.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/50064979719.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/lajex.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/63128266960.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333fe8853f4---18697247399.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/fojozapow.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/38053801178.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/sumirejikijupuxor.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vojedew.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/94498329257.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/gamum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=droid+turbo+2+specsPDF 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_off0000d22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22B 10556 bytes
SHA-256: 3b1bc1c587076c590819922429356e48cf0631bd01ab2e3a908982cf4e225ac1
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 18792 bytes
SHA-256: a1913eb25f8d0e2ba137bc7590e208c74f677828109eee46f7136418e133cf3b
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1