Malicious PDF — malware analysis report

Static analysis result for SHA-256 4739fc2719d27540…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 06:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10a3dddf7f994d66a8cf48874ec69ea4 SHA-1: 85ab922f5264b41f91b92dfee2641ed76624b750 SHA-256: 4739fc2719d27540af94f1505a374e620e032fd35b1cd075f9f0692bbcc23565
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs a social engineering tactic by presenting a lure to install a browser extension or update, which is a common method for distributing malware or stealing credentials. The document contains numerous embedded URLs, many of which point to potentially malicious content, including one directly to an IP address. No scripts were extracted, but the overall structure and embedded URIs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e800c0d8---48180024046.pdf PDF link annotation
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16139d06c0bd5d---setudutobigabofibudi.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/zevudefutali.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/kekavixosib.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/80532438967.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/93994694323.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/lesapozijunage.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/79870553089.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/40231315892.pdfIn PDF document text
    • http://carcable-bg.com/uploads/pictures/files/kewoxo.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/dovoxolodas.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/89233206872.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/19668654507.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zimokarozadusepexorofeg.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/zuvebez.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/xukajujarakababa.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/voluzu.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/8132022244.pdfIn PDF document text
    • http://rs-entp.com/upload/file/92338875298.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/62554740822.pdfIn PDF document text
    • http://qdjshg.com/files/file/zidima.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210908_170014_1810.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/37528609014.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/kutatizaridep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ad+blocker+for+android+chromePDF 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_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 10688 bytes
SHA-256: 8d9c0bbd930cdf6b1cc1de35b8d2d5733f626fee8aac03fd9261bbcc74402405
font_01_sfnt_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 17424 bytes
SHA-256: 7685c0ac5bf75b8a605ad84f6b480cd2caeb8addc735d3f5686101b1c2ffd8f6

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