Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bd187c589d8db4…

MALICIOUS

PDF

82.1 KB Created: 2021-10-05 06:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b405873270a2d30ff51286e9345e21b6 SHA-1: aabaa8553e08ba6f90a00b75f108fcb2d1990e94 SHA-256: a8bd187c589d8db40e69dec60194a13985228816fafdacca3539ea7b9608a873
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=bible+verses+that+talk+about+baptism PDF link annotation
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/6032475031.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/53597323633.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/36245614579.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/faroralebonolabusimiduxo.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/83416864871.pdfIn PDF document text
    • https://fototipia.hu/files/files/45803881784.pdfIn PDF document text
    • http://rilta.net/userfiles/files/1628349652.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/63695726219.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/feviwuguwerotixikima.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/tarewiruxunas.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/78183732848.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zakoxajukusedo.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210927004920.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/45875488131.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/siwazivizijekuwuv.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/motumikuz.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/sokoto.pdfIn PDF document text
    • http://www.moyekolodin.com/files/lajubufapajuvo.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/sunixosowatuvuzo.pdfIn PDF document text
    • https://fivetc.net/uploads/files/56007197254.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/sapajoxoxemezuwope.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89908795759.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/12062804528.pdfIn PDF document text
    • http://harlit.com/upfiles/file/97568236374In 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 19120 bytes
SHA-256: 5a723cbb091af242d64032dc1dbc8b8102d55e15b947f89ef369fcfd45380d8e
font_01_sfnt_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10864 bytes
SHA-256: 3c766ff96b9abf04f3ac4f6b601d9b550489931486c1793014abd66e39f00998
font_02_sfnt_off000122cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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