Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee3c46be0f71965…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 19:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4dfbe0554e71c8295ddf89f151d0199f SHA-1: a8ddc2b7217497b13764a625ca5ca8ac49063cc4 SHA-256: eee3c46be0f71965eea0a45ce129f4f94e78c9edbbb9557768b2538923e84b2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 hosting and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

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 https://crewmak.ru/uplcv?utm_term=dragonwatch+book+2+pdf PDF link annotation
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/52606068169.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/51795011533.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136685233614---80582150243.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/33832236070.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/fetavukovojepon.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/72992832569.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/doruvuzorow.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/21848183844.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/nemiwisoluxolikekubob.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/zexajipemizoziwuji.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/65685018802.pdfIn PDF document text
    • http://chinalabware.ru/d/files/zuruduzifeta.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109081751178676300s3p7.pdfIn PDF document text
    • http://badgerhillfarm.uk/21271953373.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/jutokizurusimozozusebe.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/39072277188.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/vosiz.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/64179530988.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909231917.pdfIn PDF document text
    • https://linardi.ru/files/file/34736733981.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/tasibajip.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/87180295370.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10900 bytes
SHA-256: b5326ee874aae9edf232694c12632212cd6d167bc942c7359117ab1912e3ec6b
font_02_sfnt_off0001090a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090A 18436 bytes
SHA-256: 61b367ff0a398bab99dd6a03a4fce0e36bd5d02c1e9c9f4a1b62ef0aac19eab3

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