Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f04e1098acebd1…

MALICIOUS

PDF

94.0 KB Created: 2021-09-09 00:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 50e12e106b8f63855eacafd4c58146ad SHA-1: 11b9e72b4d99b532c2b74fe5314cc5b571155865 SHA-256: 31f04e1098acebd1b172313431b79aaed9cf724058e6ebb6db8363527453bfb5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous disposable hosts and UTM parameters, suggesting a phishing or malware distribution campaign. The presence of external URIs and a high number of distinct hosts further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://acp-luxusingatlanok.hu/ckfinder/userfiles/files/lukuwuz.pdf In PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/waboliwok.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/33664716334.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/gogarotevevufifuxiliwulug.pdfIn PDF document text
    • https://laps.pl/userfiles/file/lezuselurap.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/24507358821.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/pulifawuvisu.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c3e5d737407e4c0064156d7beb1a8aff/koxakejiveluzabut.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/fizulasat.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376d5f9206a---94962260656.pdfIn PDF document text
    • https://curvy.tw/upload/files/xepewumu.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/61743513186.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/ruvulawofa.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210906_212951.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12875711560.pdfIn PDF document text
    • http://iucecb.com/files/file/1408907440.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/finopeletuvupejefifomik.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/baxibetupotexazowumom.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/puzepenolepe.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/toruguzuforido.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/39011352692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dravyaguna+vigyan+vol+2+pdf+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 21928 bytes
SHA-256: 043964add30a12b709667942d2275a86bbd2ca08055e23ffefafd2466cc94149
font_01_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FEA 10892 bytes
SHA-256: bb255fae6c23ca76eea3ef323893e3e7f84b8d3c0194d5da37ce90a7863866e1

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