Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b6e7179192abba…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 21:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 866960e04a20c3651f5ecf5c45b73f87 SHA-1: 59b3e54a76de062b2ae23faed35736283774dbfb SHA-256: f8b6e7179192abba1cf6409e982c787ebbce51b5cc3808327ebd9234f393fa7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or distribution mechanism. The PDF structure and embedded content are indicative of an attempt to manipulate search engine results or redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://beysukonaklari.com/ckfinder/userfiles/files/62273161739.pdf In PDF document text
    • http://creptiles.dk/userfiles/file/54498145995.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/14299010547.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/55348351279.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/39424248137.pdfIn PDF document text
    • http://sbkf.org/files/files/12079396956.pdfIn PDF document text
    • http://twilaw.com/files/files/vajimefu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dfe17ba302---furetigivafugitot.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/34604520882.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rokemozizoku.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/ridapanuwu.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/femef.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/sedegevukojubexiki.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/16314460144tF8.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/peweboxo.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/ludirupubam.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/60569194336.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/zepikurivet.pdfIn PDF document text
    • https://bnovum.hu/downloads/43459161516.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/88686688011.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/22073866643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=airplane+flight+pilot+simulator+mod+apkPDF 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_off0000ac70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC487 11120 bytes
SHA-256: a773d14781cf100411c357f78dd7617b1b4e65ad3e9aeceb6aabbdce6557acda
font_02_sfnt_off0000de0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0E 14660 bytes
SHA-256: 2cb4aeea6e746fa28dd044819340219141c7cee274cea91adbb2119de2cfcd5d

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