Malicious PDF — malware analysis report

Static analysis result for SHA-256 a588fd685f5ab59a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 16:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9af8c162df00c92ae0c33dae7009d466 SHA-1: fc4c6d1a4cc02d0952f9ff6f34e700c8b38bcc55 SHA-256: a588fd685f5ab59a037f59ae5aef60b66d99fc1c44c1ed7473cfe71190d2d121
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are consistent with attempts to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://archism.ru/uplcv?utm_term=the+six+hats+technique PDF link annotation
    • https://codecs.ro/images/file/84605630382.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/wufufofulatixosa.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/bomepaxomeka.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/doviferawemepazomiridugib.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/rurujok.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/28393737667.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/jeviw.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wogujul.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/62196984837.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/kekukigosexavafi.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jojepiwadigot.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/tebud.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef47a36e4d---ganomixababivizefiz.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/werojukijiwotizogogubu.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/33981445488.pdfIn PDF document text
    • http://apvn.info/userfiles/file/domexefubalokodop.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/navanali.pdfIn PDF document text
    • http://air-con.ru/upload/files/95301903066.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/gamefifafebobatuleweniz.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210917001028.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/12d11f310575d4361f02be439a9ec5bb/20901323357.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/53993231277.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/98929869820.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/80537408594.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/50259638068.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_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 10372 bytes
SHA-256: 3c2165c29aa43d019a7c59bc1ccc71ea8acad20017f19e03e789248d5af245fe
font_01_sfnt_off000104dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 17672 bytes
SHA-256: 4cf5f45454659277dde8916b814190c4854482ed791c801e017ad742b77ade36
font_02_sfnt_off0001320b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1