Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3e3c844193814a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 19:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 15a53d49df6b232ebe652b31ce76ab9b SHA-1: 9b2ad8bc8abc8181776e65fc497ad10a624b08e3 SHA-256: 8f3e3c844193814a10f392cacb23e10938b1e196d4594428d33b164c735ea7cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF contains numerous embedded URLs pointing to a link farm, with many hosted on unknown or potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm with many distinct hosts and a 'utm_term_redirector' flag further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pchome.uzai.ca/upload/files/pijimatowofizigevowa.pdf In PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/bolipubovoguwamumenabel.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/11563920783.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210929_105541.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/5945862772.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/2369712502.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/xagoxodu.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/56763320958.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/kolelivojusi.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/sijuvosikojevogipuvagi.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/872641701.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/69139594933.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/19822531732.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/38780595400.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/84190621023.pdfIn PDF document text
    • http://origo.ws/userfiles/file/dedopaviwonamiruzisa.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zetilikejijafemiluto.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/faguweworodazusi.pdfIn PDF document text
    • http://a-pluset.com/userfiles/repiwe.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/daputirageterorifowitaxat.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0343b9a3ac672529c5e3a36e417e4202/togifiwonolu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/gfsoq16fj9kr196ocohstgavod/16962863478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+offline+games+multiplayer+for+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/8662660243.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_off0000b2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FC 11108 bytes
SHA-256: 5c210c0681da93c293e721bea66b213b2016189f84b5dd598e2212a4e6b008da
font_01_sfnt_off0000ccb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB7 16088 bytes
SHA-256: ab7d33d664a6c404e0a9a9ebd77827d636452a5de37b1b7dbf1798c072fa25a2
font_02_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1