Malicious PDF — malware analysis report

Static analysis result for SHA-256 623c6a4ed89dc107…

MALICIOUS

PDF

89.2 KB Created: 2021-09-17 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea45ceeca4217c2e57d469045f751a26 SHA-1: 650f180e007b0e99a75fd09650ae59ab57575491 SHA-256: 623c6a4ed89dc1076ee8e19ded542aa3caff3365e5c93cc2c1e4439ac038bbb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links, many of which point to disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs strongly suggest it is designed to redirect users to malicious sites, likely for malware distribution or phishing. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_SEO_DISPOSABLE_LINK_FARM rule indicate a sophisticated attempt to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.kickcommerce.com/userfiles/file/jekiwovab.pdf
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/muxozopegikasan.pdf
    • http://www.kymkarajok.net/tiedostot/files/64127851387.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/43915910355.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a93dd097---47601056616.pdf
    • http://savemaxint.com/files/file/xemowarizaxeriguvotan.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/78205712235.pdf
    • https://habrit.tw/ckfinder/userfiles/files/7140067320.pdf
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kefoxagazifiwag.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/27064104109.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/1069085145.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131579c11a7a---xijox.pdf
    • http://chono.mn/uploads/userfiles/files/77634861128.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/58386248367.pdf
    • http://amindoost.ir/images/upload/files/vasabikobafoxujus.pdf
    • http://dobrejaja.com/Upload/file/pavovo.pdf
    • http://adabaskimerkezi.com/upload/file/21083398091.pdf
    • http://bulk-supplies.com/userfiles/files/87111982888.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/zijozar.pdf
    • https://pensionradvanice.cz/res/file/91856652116.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/vokejamepin.pdf
    • https://burstallconrad.com/editor_files/file/58742989830.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=young+sheldon+season+4+123movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f488.bin
40654ed6300b09f3529cb5c03a42a94e8496bcc595f1cba9856c6c5526af6892		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 18888 bytes
font_01_sfnt_off000125e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
font_02_sfnt_off00013dfb.bin
4b4234fd07e6c82b2b6a5f65a3f8c7455f76151f7d9a7bc0e2d36815d0757c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 11068 bytes

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