Malicious PDF — malware analysis report

Static analysis result for SHA-256 89163d30b928631b…

MALICIOUS

PDF

67.8 KB Created: 2021-09-26 12:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47d1e0f83931fc6df2923a46cabf44b6 SHA-1: 16ea5bab5104e126a223a6987689f9dff88327db SHA-256: 89163d30b928631bd2f7d8b702ea6371013f51fb87e9a1df2740fbf20d572cfe
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with an image-only design and a click-outward action. It contains numerous links to external PDF files hosted on disposable domains, suggesting a link farm or redirection mechanism. The document's structure and the presence of multiple unknown URLs indicate an attempt to lead the user to malicious content or a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://zatuchlina.cz/upload/file/rinoroju.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/wogumi.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/66649324642.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/zelubi.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/75440731222.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/34177776100.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/94881098030.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/lagekorezomasizerosazovi.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/gotuloxa.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/zewasibazunuji.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/73ec2469fa043e39d919136a66dda157/57066586561.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/74645129559.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/12639927695.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/69663311748.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/29516040700.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/gobijorujunor.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/44459137219.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/33430567256.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/welijujizog.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/79016899052.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/jufisalafugedut.pdfIn PDF document text
    • http://ustunongel.com/image/files/mepawupovago.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/96076755179.pdfIn PDF document text
    • http://www.moyekolodin.com/files/6234054562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=12+rules+of+life+pdfPDF 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_off0000ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE08 10304 bytes
SHA-256: b6223fab6ce5c1e38991cb8cbbe11c7702e84761e18dfaf5610b243d089ae200
font_01_sfnt_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 14688 bytes
SHA-256: 94fe7d5fd99976d505caca5cdbf1f8598cf90951c6914b9596509d0ed0771de5
font_02_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1