Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a4b33ba0badaae…

MALICIOUS

PDF

79.0 KB Created: 2021-09-22 10:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3a443174b9970a5c3ea1e20dfa58461 SHA-1: 7f08188798d70152da6997b25db2b69f8f8182ea SHA-256: d6a4b33ba0badaae75e725a81a36366e57623b901ca21055ec90d7cd8cc71812
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF contains a large number of external URIs, many of which point to disposable hosting, suggesting a link farm or phishing lure. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://pistant.ru/uplcv?utm_term=redmi+all+phone+2021+price+in+bangladesh PDF link annotation
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/16047628250.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/wilur.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/90491349284.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/51173566916.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/gerodewixadasafigutowoba.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/nowuxaranijadaso.pdfIn PDF document text
    • http://kvrhousing.com/uploads/15552521559.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/825784450.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd051773---gixewinik.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/96588981440.pdfIn PDF document text
    • https://kopari.hu/files/file/nugikujikixezigosotixuz.pdfIn PDF document text
    • http://agavietnam.com/img/files/kemezisosexafavuk.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/bokonogowatodemowuleru.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3434ca179858ce9421051bb8093f83b0/28995190111.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/81632498166.pdfIn PDF document text
    • https://premium-house.uz/images/file/japirig.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/94602694875.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/mekoburibemubojixanixexiz.pdfIn PDF document text
    • http://jarosi.hu/files/file/pifoxezepawewojaxujapewum.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mogeduxivaxutuzituvaw.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/63240983775.pdfIn PDF document text
    • https://avflash.nl/upload/files/90456549444.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090607150570554.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_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 18060 bytes
SHA-256: b153a48e58a8c141342df65d2d88d9f35ab0ffaecfd6eec5dcd92773ba9be420
font_02_sfnt_off000113cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CF 11340 bytes
SHA-256: 6aa80cc2d2b761a06dffd1e9bbeb6e1fcdccc536729755508dc4ad8c364572b3

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