Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af876854a8ffaac…

MALICIOUS

PDF

71.2 KB Created: 2021-09-09 22:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ea11a44666fba5bbd07949cc76ae49d3 SHA-1: 8612066cc3e04c4c4d57c96455d9223962fc0d75 SHA-256: 1af876854a8ffaacb99b42c2bfef43f1179be72dce94057f404176300f194f16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://dtd.com.pk/ckfinder/userfiles/files/95306494669.pdf In PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/47689026298.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed2d08a50---57245011229.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jepabum.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/84527764682.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/kipojizofugijasowepu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lubuvepus.pdfIn PDF document text
    • https://dalba.net/other_files/File/55290306607.pdfIn PDF document text
    • http://lenaoyunlar.net/calisma2/files/uploads/kixeniger.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/bilonemuzobaz.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/pasazaximezel.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33824271702.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/wavininepadivejezujopixa.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/45629708637.pdfIn PDF document text
    • https://parfumzone.ro/files/file/74632088536.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/wipobelojix.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/lavolisebele.pdfIn PDF document text
    • https://adikkedua.com/contents/files/sikesuxage.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jowinididamadedinoveka.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/72657475138.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/65186000748.pdfIn PDF document text
    • https://kimcert.org/E/file/35023675294.pdfIn PDF document text
    • http://debten.net/UserFiles/File/dijudisawulajano.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/69289914312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+robux+in+phonePDF 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_off0000b85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85F 15400 bytes
SHA-256: 6fbc8f37a31555472413aa2afeab451d319466df415f7f0b3183f792f1493f0c
font_01_sfnt_off0000df52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 10576 bytes
SHA-256: 88f513a3350b9c5b7d244dac3b4404ee59e32af11b13773c3a2c3624612944b5

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