Malicious PDF — malware analysis report

Static analysis result for SHA-256 973b43f328326648…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 09:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4f5cf5679bf97d949515da7b7b4772b SHA-1: bed70b8984426866e46f779203fb8b1e1f79bba2 SHA-256: 973b43f32832664854ec7f0d87fda21ee36511b22b076d2ff6684e2a0358f292
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=samsung+galaxy+s4+in+safe+mode PDF link annotation
    • http://allineers.morefriendship.com/upload/files/88716991024.pdfIn PDF document text
    • http://abwrva.com/uploads/files/pesodamuravupofozanilin.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/42525dc78fc249770a990c7c8c176509/5721382435.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///retimogewa.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/32885921469.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lejajawelutupoz.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/mujijupokagapapo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/44441504676.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/63qphpr50h1urs7lheavpnsqgu/58498116116.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/fuwoso.pdfIn PDF document text
    • http://erimti.com/userfiles/file/nulas.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/maxibu.pdfIn PDF document text
    • http://davcpundri.com/css/file/38072739867.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/48718050501.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/54687696503.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/muxedowoted.pdfIn PDF document text
    • http://irollee.com/userfiles/file/vifamotimejekatuwimeju.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/54282803103.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/39550074859.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/mafosokejalozuji.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_off0000dd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 10968 bytes
SHA-256: dd4c3a33f16750a5741f950d652aa6eb51c2c32ae0bcea92ab4022f095e6339b
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 17696 bytes
SHA-256: e631802faf8ba55597586e114d0702d322db5fca4c499791769a8340a5b36492
font_02_sfnt_off000124d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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