Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b613359ab083025…

MALICIOUS

PDF

75.7 KB Created: 2021-10-07 00:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1084d38b39a0e51e43790e622c47df50 SHA-1: 03e2e2e6743280bde2536169ef4927b9b76f104d SHA-256: 4b613359ab08302509641f620dcdea83978c2e373ed114c88348a8e2a3c36e7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to 30 distinct external URIs hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=testing+tools+interview+questions+and+answers+for+freshers PDF link annotation
    • http://etasystem.net/userfiles/files/25069124894.pdfIn PDF document text
    • http://orenprom.com/img/account/file/fadedop.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/99650800870.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/63500936803.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/40871208856.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/fofasagemal.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/tematisurerim.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/korob.pdfIn PDF document text
    • http://nprofit.hk/userfiles/tuwusapapanidemi.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20211006032110.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/30575810137.pdfIn PDF document text
    • https://10fci.org/userfiles/file/83309028492.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/nisurupezumavali.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/63355380283.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/11721716220.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021100705494194.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/sodojiluxugarebugifixomab.pdfIn PDF document text
    • https://archicakedesign.com/upload/file/11492614644.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150602da725f---zoxog.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/lanoxug.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/66291540379.pdfIn PDF document text
    • https://t2sc.me/userfiles/13631632584.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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 17536 bytes
SHA-256: e5abc14de99f58ca9f0a374822f511e4acd79981c2efd95516db7305a556fa10
font_01_sfnt_off0000efc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10996 bytes
SHA-256: b6197191fd6b948ae2d0d54ff4b7d64ac8b7d230170a3fcaa8c01fa55ce0053e

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