Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc999228e6d7541…

MALICIOUS

PDF

89.9 KB Created: 2021-09-19 13:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 45a2e5bc69dc7ad5d8c13148a701a2fd SHA-1: 41926ca181e00bb30fff02c561d28b1add5cdecf SHA-256: fcc999228e6d7541baf427f58895c82d1dd7d0dc66851366eee96515137b356c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's used for SEO manipulation or to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure and the presence of many links point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f02fd70096170553710f1cad0e8e03ac/75104259213.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16139b547cb368---28195291516.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/farebenukolisegepafebax.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/8866412035.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ruremifaxipimusiwudod.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/kavugugiliwixojil.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/29515672508.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/pinuxobaxa.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/78109227885.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/podavupoliwire.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/73749168277.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/76260116961.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35942503271.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/57f1f65a08272ecf8d5dbfb101129f17/67489315225.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zafunefavanosipi.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/52731750023.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///72058301258.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/64102611863.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/38634284513.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/968122304.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210919150923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tamilyogi+pirates+of+the+caribbean+4PDF 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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 11220 bytes
SHA-256: 652c681f5eb65a2c7accc58b036014642ab22bba8890460cdb28d45d13be2aa6
font_02_sfnt_off0001239f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239F 20808 bytes
SHA-256: 70b6f72ee9d6cefce47818b6318786e587e66cd07f055742f1af5c9f482c2bfc

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