Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3ae0c59f25e6cf…

MALICIOUS

PDF

89.3 KB Created: 2021-09-24 11:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9afc4880a65f0d4e4e92b3c02ae3c85 SHA-1: 8c58178e9f6e3cec8ae8484eb00fcc530d1ee418 SHA-256: 9d3ae0c59f25e6cf407bc3719d42977c7c8d051f299a287a06d3b23ff98dd37e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, embedding a large number of URLs pointing to potentially malicious or disposable domains. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=open+android+img+file PDF link annotation
    • https://takipcisec.com/calisma2/files/uploads/binofuranejoj.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/37898516012.pdfIn PDF document text
    • http://yejida.com/userfiles/file/limewilufawomiduwilerol.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/54872286981.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/suxinibijax.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wawagemedo.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/tiderojodexebibudoxalodu.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/jixolisodewamarukedulem.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/linofejuwokalojuvapa.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tuxikizoxo.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/wojarebosalunud.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/84906357121.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///fakapo.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/luxekuvitefo.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/2059016626.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490b01bdc32---54381170728.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f993ad622f50e096882335d7d4ed9191/68734103237.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/65963788194.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/4226153878.pdfIn PDF document text
    • http://labonscafe.com/userfiles/59069907593.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/86794569168.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/naperatesupakolomikobuzo.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/wifufagugujonadodak.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 20268 bytes
SHA-256: af01e63130aacf4881c79688e37192f6faf76905af0d0dbd71527ce6998f536b
font_01_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 10600 bytes
SHA-256: 24d22029097f138c3de81db59fa88b7cfbcb6869df2b157ec75ee4f3a6321f99
font_02_sfnt_off00013f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1