Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aabb00a1ab4be75…

MALICIOUS

PDF

77.7 KB Created: 2021-09-15 14:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c1351b0162b3e14355a796a97687f2f6 SHA-1: 078058fadfe7b817e9a72765111217c1d5f2f746 SHA-256: 0aabb00a1ab4be75dd1f7158a8eda61c4e717728c8dcfc9d0c67801657cd49c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external sites, likely initiating a phishing or malware download chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=android+manager+6 PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613245de91d2c---javojidixowadu.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/33994980177.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/64264256316.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/xifeditevomosizovadepedu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/28557419818.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/mabajejaze.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/40634975335.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/betaguzo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/mexugeba.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/55349516326.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/58324945064.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/pezotazuko.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/63015220683.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/sufupeletutosa.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/xemerusakebodavenamevixum.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/2173778705.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/valamojuzabugoxaxaxo.pdfIn PDF document text
    • http://guowangcable.com/d/files/mexop.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/gisuwukawef.pdfIn PDF document text
    • http://ijfbn.com/editor_up/migatidutevozegezasijowe.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066a1dca4a---muwugixeganuse.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/kexibutaz.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zewakepomilifomulutuk.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/kasemovudofipen.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/vumatevosotati.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_off0000ce01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE613 16844 bytes
SHA-256: b5efae451ddf2c6de73db23854d585391530425b03fd30ade1eb0d72ab9c9fa7
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 10428 bytes
SHA-256: c9f2701ddd2202767f443309a8dcfaebc58cc2416fd74a740e0b480eb1d5e859

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