Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f796b5c06cf7a66…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 08:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a0dddc3844c98a9adc91e98b529bbf1e SHA-1: a41945c0250bb8594183bec061923ca20113112f SHA-256: 9f796b5c06cf7a66cadf3c5a8fb6441006b4de878979705366a7b84396af3d0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct domains, many of which are unknown or potentially malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of link farms strongly suggest an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fotobolfestmeny.hu/mvc/userfiles/file/gelet.pdf In PDF document text
    • https://leo.tw/upload/ckeditor/files/81619861546.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/41411433314.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/zelunilovovilirukepe.pdfIn PDF document text
    • https://aitalk.vn/upload/files/tawasipogeduxozi.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/mujawowupanidejemob.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210908063233.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/48058490430.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/suzomewopaxokofe.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/bimoropudojavolovor.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/gitopo.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/toraxatosunivabaresam.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/sewafinowonedimurosimaj.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/tukezonok.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/t53bu4dr8sgcqs4i8v204b21lf/mugobanezewujunetuga.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109171035348487.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/71007130369.pdfIn PDF document text
    • https://ms01bet.com/contents/files/23582860564.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/zitididodifomesep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+video+on+androidPDF 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_off0000d54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54C 10312 bytes
SHA-256: 9e48a1e92b8b566c390981bd6727b544c3ee1d7daf9cfb1d262ca8bbaee50776
font_01_sfnt_off0000ec88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC88 17460 bytes
SHA-256: 717205abe6cdfcc3bce177da29a7e526393021748c819d8fb15a91ba1cf33d94
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.