Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdb0cd376a37637…

MALICIOUS

PDF

83.1 KB Created: 2021-09-20 07:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bdd5f9a5574b3d840b631b310a98b0d6 SHA-1: 5d9ab8ca9b64e68f18a6a2144d519b70c1b57c8d SHA-256: fbdb0cd376a376377f41cf14a2ffb1c0c876ce44b1017f16166f23de3e9fd50f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are on disposable hosting and likely serve as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique. No scripts were extracted, but the structure suggests a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://audreyheselmans.com/_files/file/80435467723.pdf In PDF document text
    • https://infoenergie-loire.org/userfiles/file/85125646411.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/begebelidezuvagedinuxe.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/86068554083.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xunonesipaju.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/pubiladojameti.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/70057927011.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/52128563096.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/52411826015.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/68930759589.pdfIn PDF document text
    • https://okazionche.com/files/nizonisuzo.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jelawunimo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xibumemexawese.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d2087e300da1726ad01a2a33e6642cd9/pakalas.pdfIn PDF document text
    • http://hillcrestneighborhoods.com/userimages/87045455839.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30c5d2110---pokiw.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/36362401432.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/16488042782.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/duriseguxegaji.pdfIn PDF document text
    • http://apsons.eu/files/file/72557398847.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/70963593314.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/raxavogorewikipuridafewu.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/wunadapozoxogojiposu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=m3u+tv+listPDF 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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 17632 bytes
SHA-256: 640f70710564fd63919cb5ab71856f07322e43cbf5f866ca07066060c2fc029d
font_01_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 9816 bytes
SHA-256: 97252b0b09aed1361b6ff1b76d4f9da36a3ff17039e76fb4282d6a041cbee39b
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1