Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9906b5f4aae5bd6…

MALICIOUS

PDF

86.1 KB Created: 2021-10-17 12:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 90f584d88a7eabf3ea4f5536c6b7884e SHA-1: 1208d38a2a458d3af019a1e786d0c8493a47584c SHA-256: c9906b5f4aae5bd6a38fbc28b806022101b8b4ccae6aa3c786180f57563d860c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which are likely compromised. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. No scripts were extracted, but the structure points towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://szabobuszrendeles.hu/files/files/bafapalugevobegujedifujat.pdf In PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/59702499368.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/wewilewaf.pdfIn PDF document text
    • http://giga.sk/storage/file/fiwowenamuti.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/gabikejojalapizepixaf.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/86780448914.pdfIn PDF document text
    • http://hanleyresources.com/images/78200190814.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/xagiwulofumiditozawad.pdfIn PDF document text
    • http://selidbe-beograd.info/files/kubozinafuj.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/vimegebapewifo.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202110040509032579.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/39868600677.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/lufuwibutafewopex.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/pozubelajevigowabute.pdfIn PDF document text
    • https://arerp.kr/data/file///67927708452.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ea8cab58---54160000152.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/ribulip.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/kajanosupurotezexi.pdfIn PDF document text
    • http://saowaneecamp.com/UserFiles/file/15260153853.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/63626158100.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/narok.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/64930186410.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454a97638ec---xefinakakedizazajifaze.pdfIn PDF document text
    • http://jarosi.hu/files/file/jakitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=nutrient+broth+microbiologyPDF 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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 18160 bytes
SHA-256: e459a617ea4f8f4112d0eda1346cee7866a0714cbb9f2d3905ca94757c089db2
font_01_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13252 10676 bytes
SHA-256: 7fa19e796dc8e87f3c39b915608e91562f0a4e90de4e652e8ed62ffcca7c76d8

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