Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8ecbcfdf134b2a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-15 13:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: deba512515800655f7b2bba77a327734 SHA-1: ce1a4d37d3cbf9d8032b009ae7e896c85ebc9791 SHA-256: ba8ecbcfdf134b2a986cbad605df318f895ccceaf6045d47cfb91e079cb72ff1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript may be used to further obfuscate the malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+install+apps+onto+sd+card+android PDF link annotation
    • https://concurs-euclid.ro/upload/fck/tomapi.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/duwusirovefumimavuj.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/rorif.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/pajupuku.pdfIn PDF document text
    • http://stefani.cz/fck/file/fagomuv.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nerimotivufowutuwon.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/xetifujesapejus.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/64849490651.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nekodexiparorise.pdfIn PDF document text
    • http://taociren.com/upload/file/21091509510418750104zk5kchwvjc.pdfIn PDF document text
    • http://sartor.ru/upload/files/getotemubuxokosokiwo.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/geravovolabobejo.pdfIn PDF document text
    • http://kite-surf.sk/files/60467193458.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161411c5427c87---ludabafisakupewe.pdfIn PDF document text
    • http://altus.pl/userfiles/file/66966936960.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xulusotego.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/65066577060.pdfIn PDF document text
    • https://masihpt2.com/contents/files/tonupinubevogixamiwo.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/74861907201.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/sebopedeb.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/suteteduloj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xozado.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/mamadawomadefutevoni.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/mipubakexutiz.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_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10452 bytes
SHA-256: bea3ad42b3ff50e548741f9946fed8d54276b036426e66db8f43783200755d0b
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 18904 bytes
SHA-256: 6169ad0312187113d1ea2ccbe4abe7a6f4d82ee667bbfc7906eb0895890a97dd
font_02_sfnt_off00013926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13926 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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