Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0a6ac2e283520b…

MALICIOUS

PDF

72.3 KB Created: 2021-10-01 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afd91c32f6deb1893b883e953fa4c4a8 SHA-1: 93c383f3367d32bba16935baeb633d2c3fa35c96 SHA-256: bc0a6ac2e283520bc7b462c0e5363a0f656491d2a4e7747a4e93cf113309092d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=photo+grid+online+without+watermark PDF link annotation
    • https://5udua.com/contents/files/55346435306.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/jajajufiziwisig.pdfIn PDF document text
    • https://wmu24.ru/media/file/papanijipifulukikowovam.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/koluwugixulefifovoluvif.pdfIn PDF document text
    • https://yilmazlift.com/userfiles/file/kabejidovekado.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/95112816063.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/bitawutupiwipoku.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c90bcf2cada2f667e1acf93044873026/fujojukel.pdfIn PDF document text
    • https://costarica4d.com/contents/files/wadibaz.pdfIn PDF document text
    • https://kiptep.ru/file/fufogarigebokug.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/31433700615.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/xevolematajabinilawumut.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613839ffae282---65225021919.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/minuwototufaz.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/97467361349.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/70450175367.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210910140727.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/xokuwuvufubomezolakagen.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/91135461316.pdfIn PDF document text
    • https://mimpishio.com/contents/files/38807974471.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109120404126680.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/81894368952.pdfIn PDF document text
    • http://gysanya.com/upload/file/210924112048838070pemkbebw0r6r.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/koniled.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/78762252819.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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 17776 bytes
SHA-256: 1f00f89c553d424a4708940a771cbe9f72a70aa0f4fde85fc1c8497c33542671
font_02_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 10808 bytes
SHA-256: 4fcc9773af4d04bf961c7725d84f1a3439c1e733c2af307d8c577644511ac57b

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