Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e59c22d6118553…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 13:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 807b4fe7fb50e15ef7aa30d0881ae3cb SHA-1: 8292118fa0987851e57b425b6e71f4b403b7b8eb SHA-256: 53e59c22d61185537654e7deb83113eb4051068ca2d43c563885c8f4b12f5536
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs that point to disposable hosting and appear to form a link farm, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=offline+games+similar+to+pubg PDF link annotation
    • http://svazekobciorlice.cz/userfiles/file/tifuziwu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/6269495190.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/20427687577.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/xatofobi.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/fotominerugevatoruneguj.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dunen.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44491176694.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/79610629933.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/mifonutaju.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tagoji.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/73364855154.pdfIn PDF document text
    • http://195exim.com/datas/files/xitoresonusakeg.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/64009449384.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fca57d1bde---12286059178.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/bamaxazeguzudi.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/61027881994.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/muwagebotatigutavib.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/motafuwoxik.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/ludefefonenefix.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/ronodamot.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16140917ecf378---posukimaviguw.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/36381920224.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/67750832845.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 17884 bytes
SHA-256: d0ad8c923f47543bb1e30188f3213fd31d268260e5697d89d5e18a48eed5ac66
font_02_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 10968 bytes
SHA-256: d272a743a234f488ff1291f83606eaf158039ce9f6dadb162f1fd48b36ea1d54

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