Malicious PDF — malware analysis report

Static analysis result for SHA-256 75498547593de2ba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-24 05:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f59512a7b4a56af3c5ca53c71326e4b SHA-1: 8c42fed3e541d15e85816dcac090603fd787f81e SHA-256: 75498547593de2ba44b0bc6ad6199cd6b19d12a4e395cd6f6d30fd84cd5ce917
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

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://smidgel.ru/uplcv?utm_term=skins+for+ff+pro+apk PDF link annotation
    • http://lienming-rubber.com/uploads/files/202109111633005767.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142376cbc644---54892119886.pdfIn PDF document text
    • https://pisausakti.com/contents/files/79511422918.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/17138569931.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914082433307.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/3304696947.pdfIn PDF document text
    • https://felicityokolo.com/file/28533479596.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/76589541300.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/wevakululowadarewa.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/wugalumeje.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/32728891491.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/wipag.pdfIn PDF document text
    • https://datajournonepal.org/files/pekineluzomadifad.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/38188199267.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902000121.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/wujapab.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a62c302621ce52d21fa08a8f3e966a6c/belidan.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/pixetobegefesodel.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/82635490831.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/lawobomigugikuxexito.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/94880496053.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 17128 bytes
SHA-256: 81453fbcd7e0c155c30b52d4a091a9d47641cd97c8aacb8bb7c139184853654f
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 10244 bytes
SHA-256: c80a6a3fc9d74191e1c328e1ee185d807d175e935e76cfb00921e43ee3a6d818

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