Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d558994b53a8611…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 13:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3743975142c712af2b9d32a58c3eaf5 SHA-1: 0eeffc03c741d3e3f1a2819878117c7949a920a3 SHA-256: 7d558994b53a8611dc9f59cc4260f1a0d9e85ddc70abc09f77cd93c1a4d7aa55
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to disposable hosting, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=where+to+download+tubemate PDF link annotation
    • https://mobilaide.com/upload/editor/file/vatewejomirinoxod.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/11711712778.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/27239272265.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/31354451171.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/faxigajulezazokeliparufiw.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/65435140856.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/28282503758.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/55073943328.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136162dbfa61---tolege.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/61805293697.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/19791670514.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/15077787656.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210903155437386019g3cw7g6mudjz.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/90316822542.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/95914266393.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/ragodebog.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/41208396224.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/momopat.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/dubija.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/48592195557.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210902030648.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/29085928144.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631519271.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/kejotoxi.pdfIn PDF document text
    • 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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 10572 bytes
SHA-256: 40678466755e78cfa74a2af2e3009850d550b525c046e9d9fce815fae70a4dce
font_01_sfnt_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 16228 bytes
SHA-256: d9ebd6de7730b4c7aef285aa67dffc9aeb8bb682ed86da78ca2a483bee1db05e