Malicious PDF — malware analysis report

Static analysis result for SHA-256 992ca1a024184317…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 12:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: d58617e7a04a9fb272ca9391f3d478c7 SHA-1: b79ad97c5d7ee3239aaf6cfbe4f85909468124a8 SHA-256: 992ca1a0241843174bce43f9dae12f0d7a492e9bc4a2a7874e683db4f50df59a
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 0.9981

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 http://lamardaegu.com/upfile/user/file/84958586372.pdf In PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/88332369102.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc5b1caff---favigipasogu.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/7919605645.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/rozexijewoboset.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/55717007388.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210905013041.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jisuxoworiwanadip.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/makejim.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/91190341068.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/zajokos.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/jroqqfiqv0nnd2j7af6akt4r3r/51386877638.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dijilawitawotajuzevax.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/sirenawepekuv.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/lesuguwovozujuno.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/rixoxokaxaxigiziv.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/38700274603.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/sopog.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/kisogumerero.pdfIn PDF document text
    • http://elma1.ru/!upload/files/pizolobejopineravejakidev.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/65320769799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=heracleum+persicum+pdfPDF 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_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 19704 bytes
SHA-256: d9dc34ebbdfec71aecf440e0a8e7b62d83e14b474051b695f30999431593729c
font_02_sfnt_off000129f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F2 10548 bytes
SHA-256: d9243f95db56fd363a5477b32e9f24b8126be6371a7c4714867d092ee57ff6d2

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