Malicious PDF — malware analysis report

Static analysis result for SHA-256 233194df9da8897c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 23:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5a656b64f4a1df9d2190f72043468545 SHA-1: 496c61f7524207787778e614285abeae9dcada27 SHA-256: 233194df9da8897c2493904d3beac7042774dd7a270117d8ca4d8b21c03ec5c4
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of external links and the overall detection profile point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://caffepontoni.com/uploads/file/bizexajefapasabobatevum.pdf In PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/33607221801.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///nogosoloxoda.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfd3b99a5---17867075674.pdfIn PDF document text
    • http://aa-nusd.jp/wixavanojilo.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/4170269548.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361e97d5de4---fotozoviwekeb.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/49665569838.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/63291038949.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/34252800738.pdfIn PDF document text
    • http://nincity.de/inline/file/92473249001.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/60670611110.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/kigukukegekal.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/dibijoj.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kezagewoxu.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/turazeju.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/galafejoxesimixuwejap.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210901062706.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/segoxakadomifana.pdfIn PDF document text
    • https://anfauglir.com/images/file/pisisuluvar.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/wimopimuzanoxexegi.pdfIn PDF document text
    • https://vitanov.rs/files/87619689475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=20+examples+of+system+softwarePDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 16932 bytes
SHA-256: b43bdc8f6bb1ca641c7fc6d656408ec2e1eb78d8dc1d863edd5ebf649cd707e6
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 10768 bytes
SHA-256: 3cfeeb482440727d709b4839ab4520ced6ca7ed1128a3e500184649af6210e35

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