Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9255e05e16c9cf1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 15:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8868f575c7e8218bd987b789b4ab0c1a SHA-1: 429d0a8bf23e0ad426dce0d43ad344fbae0619d0 SHA-256: f9255e05e16c9cf128e41f4e484b7d12386d372759e0529f6374fb4c75dc61f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=samsung+s10+vs+iphone+x PDF link annotation
    • http://mega-gold.com/userfiles/files/kevamuruwolupokipogevo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613952ce30022---bolupuzifufojo.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/81719721228.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/59199417203.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109241955508618.pdfIn PDF document text
    • https://gangnampools.com/contents/files/34722558708.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/11503986035.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/38634583789.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/15893922864.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/keduluzexi.pdfIn PDF document text
    • http://domplus.su/userfiles/files/33259210698.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613801a3cf6ab---23769564986.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zoputenokibugemajutuji.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/14058668054.pdfIn PDF document text
    • http://secretinvitation.net/images/files/58550157765.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/22612659006.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/97102959338.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/72139355420.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/78223906233.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/wevezejiwovozuwozugoz.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jepupibetajirumeb.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/11452736687.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_off0000b173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB173 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98A 10972 bytes
SHA-256: ce2974e5cea0de72f551aee46ea236451acdfe013a55a86634cd916a856e5ed7
font_02_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 18388 bytes
SHA-256: ee21ee54046505392b20cbbf4b498313991c261eba014fefb1eb2276e0a70adc

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