Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b15eeb8709e721…

MALICIOUS

PDF

71.4 KB Created: 2021-09-11 12:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 7b6898331d72da2a4a4f069496464dfc SHA-1: 346243ed175632454b6a5ac71c1a1e501a74ebf0 SHA-256: 35b15eeb8709e72161a0dfedf0100d1d8ae7cd5a1e8fb121ddf517db3f69823e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://faktxeber.com/resimler/files/fotuwevusosofigizoxalilis.pdf In PDF document text
    • https://sankaibearing.com/userfiles/files/86040941139.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/31542357276.pdfIn PDF document text
    • http://caramelitos.sk/files/97659740769.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/46234693481.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210908_BAB6A64126C95424.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/28704205658.pdfIn PDF document text
    • https://datajournonepal.org/files/44796882145.pdfIn PDF document text
    • https://pixel.bg/img/file/96514762982.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/pudopivigavixilowijib.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/83499499418.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/47455225852.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/51105555381.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202193125254281.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tepulil.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/71715779268.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/59948348503.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/pogazeritinusijawiros.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/77192022267.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zutivunama.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/51822260078.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109020227169691.pdfIn PDF document text
    • https://norservis.info/files/files/32233930899.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/9964301115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=top+tv+download+apps+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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 16472 bytes
SHA-256: 8fb22044e8cb578c8f84e982b380720297cb6e8defb945a3225b06bc04ccbf57
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10368 bytes
SHA-256: 025e144678c4221a3538f0e8b6d04291e285c719e28c36235b22b3b747228cbe

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