Malicious PDF — malware analysis report

Static analysis result for SHA-256 9046cccdac12318b…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 20:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1eb04c76adbdadd442a9ce4eb24d390 SHA-1: 0a34c0a1780ca2d5d1a90a00cbd4ca1eb5b3cbf9 SHA-256: 9046cccdac12318bee575c0d2407cc17909e2dfde19c51baa771886195c01567
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://arrayamed.com/userfiles/file/selazene.pdf In PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/guvolope.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/3943928943.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kuzesovuzobeguzagal.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/19597397307.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/71850096623.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/jireburofexufufitametab.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/bevabifobalipepub.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/lenewamamawabozuzev.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/somej.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/jewabuxakonoligevenulaka.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/85326792342.pdfIn PDF document text
    • http://mobiliteit.nu/files/wawaxav.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/toguboda.pdfIn PDF document text
    • http://julianina.dk/upload/file/buvaxa.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/89721146563.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/melipimapakunepokidiwe.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/26789730203.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/75091079627.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/45779728270.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/70686099678.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/79858794275.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/berexirato.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109140634457795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pull+to+refresh+android+studioPDF 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_off0000af94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF94 16160 bytes
SHA-256: 5e0780fa456657377902bd9ac2b45b0b7c1d55d43df031122efdc321f473d355
font_01_sfnt_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10552 bytes
SHA-256: 97972597cff382fb0379fe5b7583664c45cd691429ce872a08399f37b4481e13

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