Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d35b20c3fb20f2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 17:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f90f8d44ae3cca3bafc5a04d8812e573 SHA-1: a4ccda5dc6694fe182c79f421325d60d95da8ff9 SHA-256: b9d35b20c3fb20f2086f68dd123996ee5dddbdd008a6a986f5cc2b2cdbb368ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, forming a link farm. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aljuboori.com/userfiles/files/zojofemevavuxelar.pdf In PDF document text
    • http://medrea.ru/upload/files/banolanarenan.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/26855199347.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907024932.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/6759829244.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/pikalifipidogudifomoke.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/jesopokisuvixudarubaj.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/22237087872.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/migivebajigobotimidevebo.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gapuvowisideseka.pdfIn PDF document text
    • http://newworldss.com/uploads/file/biroben.pdfIn PDF document text
    • https://mbbs.hr/files/ripexexolojof.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/17775884085.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/jususenemuvunirebede.pdfIn PDF document text
    • http://rem-proekt.com/f/file/bavovuf.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/49383367786.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/91035750106.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/zofojosazevabexum.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/78597024850.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/rawadogabafosibizisala.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/42363079899.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///2878752429.pdfIn PDF document text
    • https://partetesal.ir/data/file/45870260141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=monthly+search+volume+toolPDF 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_off0000b3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 10676 bytes
SHA-256: 9479d795fbfb5f8786344b7794059b430c3cb632f0c26f557c4203666a0b1fa0
font_02_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 16852 bytes
SHA-256: b48390fcc8e9eb330d4f92c82d7cc2ee535a552c69a609848dfe33e74fb25799

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