Malicious PDF — malware analysis report

Static analysis result for SHA-256 812e247cd9d39eea…

MALICIOUS

PDF

80.7 KB Created: 2021-10-09 23:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1c106d57f2b07814ee8c9217571bb09d SHA-1: 0f7fa73e256916bfaa31e747a3bc6b7f5e11ad41 SHA-256: 812e247cd9d39eeaaadaf16b8687471e25b9804a14eddad306136b61562a3ce7
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://hyosung-gulf.com/uploads/file/23745034737.pdf In PDF document text
    • http://mawaevents.com/uploads/file/sevaforedelawoji.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/pegogulibenobanixufox.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/welumopomedomo.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/86277195773.pdfIn PDF document text
    • http://texmet.pl/userimages/file/20584893340.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210929_195859.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b83e3b644---kimekigoponarupazuden.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/sidezitake.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/61762546810.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/33911961789.pdfIn PDF document text
    • https://cronos.jptecnicascr.com/yiicms/ckfinder/userfiles/files/tejesigoduteroj.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/22745792651.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/dipolir.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/xaniwidigax.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/26722635015.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdf1ad4210---39014966916.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e04889dc33---vaputuvevulekogesoravu.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/49437738029.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/puralajowoxodujapezimebo.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/52753105662.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/libanez.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/raretexudoginewinoma.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/zajiluvirumuxelud.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/vibivibunexewuva.pdfIn PDF document text
    • http://www.siposferenc.hu/html/14304733058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bollywood+movie+quiz+questions+with+answersPDF 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_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCF 17716 bytes
SHA-256: 596dde08a7dd4e23b5b359787ed5f6ddcc604c9f18cf42ace8f76069f9bbce38
font_02_sfnt_off00011add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 11136 bytes
SHA-256: a8ec05193bf88930075a02eb9a8803c051fb4a7df3ad37cd87b9f674f8d3df9a

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