Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10fbcd269f76d7…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 16:53:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 12c81e7bf1a20ccc2e360bba265e4dce SHA-1: af8f55af2a981bfeac8f4f57856471f157c3871e SHA-256: 3f10fbcd269f76d724fc13820b0b68f638ec95c1c4afc2860ddd1b3dcf63f6a7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://infrive.ru/uplcv?utm_term=chip+material+design PDF link annotation
    • http://aihyang.com/userfiles/file/63519844922.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/fizamuxajofanofemuki.pdfIn PDF document text
    • http://goldmustang.ru/files/files/58116387189.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/49920318299.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210912180308119.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905152233.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/7992470553.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/19291854870.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/bulenuwuzibaf.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/59458291719.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/dinuvud.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/fevufexusinetufuvosereba.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/12249196843.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/zosak.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/79456188487.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/tokipejabufuxu.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/ledabivadelexoxixav.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/83803628115.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/32006429179.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/mujunibi.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/52685196935.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///49810087263.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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 17672 bytes
SHA-256: 5d65e0b72d18a8d6a42e820ee05b059c68f279135a63f26b8427e42314ebd738
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10752 bytes
SHA-256: 6d2594fe5f3f2dad27ae713be2be9b1f15af76617f99f4fc90418322280d18b1
font_02_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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