Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bd0b9d1df3eaad…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 16:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e535bd5a41b5c88a2a3990eea47c3dc SHA-1: 6b3d2539eae447bf67f08b8ae281f39d7a2fc9f6 SHA-256: 14bd0b9d1df3eaad61f77dec65318b43eedebf33c37ff9418e9d66e3b65d53c4
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external links, many pointing to disposable domains, suggests a link farm designed to redirect users to potentially harmful sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://foodexgida.com/uploads/files/87556131161.pdf In PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/5429436877.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/45334359384.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/95251444343.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kufewikatimimevarojugowev.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/noxiwubu.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/tazuluweposapus.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sirobiremagivipore.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nolafaxedakoke.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/sosuvifoki.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/bibikaramikubi.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/49151651388.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/rujibolumiwez.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210910092250.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/41411433314.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/lakobabi.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/76621983301.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/38578897106.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/posutel.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/nuroduwerurutipatunofor.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/18226568635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+secret+book+online+pdfPDF 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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 10752 bytes
SHA-256: 26839c88319c8361be9c0cbc2c04a6cc9319f42f0a83ee195c8d1f68b84cdd32
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 18028 bytes
SHA-256: 921ba7b491f1cbf925db97ab187547bfeabae41b5a179767f526313d41258f54

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