Malicious PDF — malware analysis report

Static analysis result for SHA-256 3085bbd5fb1e9385…

MALICIOUS

PDF

85.9 KB Created: 2021-09-23 05:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4cd2e1e9a297f291cc4803067b9ce66 SHA-1: a2519f3165862f11d2fcd66b7cc463fe4862f080 SHA-256: 3085bbd5fb1e9385a8bdf15823ae6688c31d89875ab16ecabb0a78cc879b1a3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent to distribute or phish. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aea879eb71---92458458483.pdf In PDF document text
    • http://verynailscm.com/user_img/file/mavomu.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/xaladuvilabadiwosetibalaw.pdfIn PDF document text
    • https://jjpremiers.com/files/1050390582.pdfIn PDF document text
    • http://asvpp.fr/pdf/86457155515.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/13037739026.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161396b4d08642---8992882438.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/17467297027.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/jikimawatavebozegupiw.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210919061417.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/96664194688.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/ravuvazun.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210914_183203.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/88262714270.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/posurosizafiwaximix.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/86204946495.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1540645933614042c9f0319.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/piduwow.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613299d1eec8b---16519767288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=android+default+file+managerPDF 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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 17824 bytes
SHA-256: c5c076626de82879192646682dbe29f7cd70c2fd4533fc5a30886b0bea7e5d8f
font_01_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10612 bytes
SHA-256: 7c618f278593cb55b24f5512b20ba1201b3674e3da0567f091eea96abf5f6fd3
font_02_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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