Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b85de81ccf9d9a…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 22:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: eef33be0c9555b901d84a2c9f0fa7208 SHA-1: eda64224f6b6976ff0fbf8993f11cddb47d7e086 SHA-256: b0b85de81ccf9d9a9d197efe1053d62acfb4f775cd1cca97f5e102b018991ee5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to direct users to malicious sites. Although no scripts were explicitly extracted, the nature of the PDF and its numerous external links point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inprovitbolivia.com/ckfinder/userfiles/files/26900339146.pdf In PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/fufuliwufikega.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/72131294466.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/44186285834.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/64823832940.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/73399686265.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/nigomanugaxidonunaruzow.pdfIn PDF document text
    • https://aksusu.com/upload/files/72947839555.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/kexitum.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/dodafejebevagumizuwudu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/jumamegez.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/78118639340.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/sesejoburu.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/2380050663.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6418bf1f---54217761484.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/77253229433.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dexivopuxaroberi.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/faxusogededuwes.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/89773874042.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/39aaf9bb366cdec0a2a59d5f09db8480/xumes.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/debadakemoxiniv.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/15394669031.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/salewasudiligab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pole+barn+with+attic+trussesPDF 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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 17216 bytes
SHA-256: c8dda26ddaf214a5133c7e52b968752b86868e6896efd743718aeefc51ae362e
font_02_sfnt_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 10652 bytes
SHA-256: bd0e69ad237f3323d0a4dff3080af6cdc301fabd1c28930bfc7dc6c35d301961