Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27bdc4c9063da83…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 21:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55c76e478fb617b9547fe537b5a91efe SHA-1: 1ad7dcdc1b173ea7b40f3b5d8e3d05728f8a2c88 SHA-256: f27bdc4c9063da83ddee69282ba06f15b11afb1691ea6e72d51e8d8187c7939f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=free+epub+reader PDF link annotation
    • https://brawlcall.com/ckfinder/userfiles/files/82034212046.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/18812526123.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109021858205854.pdfIn PDF document text
    • https://luminex.pl/upload/file/javoniboren.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/sulidozot.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/23136351664.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/65065288387.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/bobusu.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/30142079395.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/60175494629.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/sabawizewaludapom.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109060744249019.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/gamofiz.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/504924297.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/tuwokevilupinop.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/92799671181.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gumofonurujamugipozowexo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1d8f92e4a8d9beaa8fb859cec95dc1ad/15035364470.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/16919076130.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/22603513566.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/75823270497.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/19624419739.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/gadugosilux.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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 17124 bytes
SHA-256: cb0ec6459eff355b048c1e35a82aa5d1929fda5a996ce4891187a7a619b01ded
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 9976 bytes
SHA-256: b10ef5724b7f5e5210188e75c45ed00d8ea13c1d76245259c0ac31a092b36277
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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