Malicious PDF — malware analysis report

Static analysis result for SHA-256 c478163e8dff7e9d…

MALICIOUS

PDF

88.4 KB Created: 2021-09-17 14:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e4f46381130808291547683bcd5ea12 SHA-1: 2e74cd83f202bb6db2b5939d377cc96357a3211d SHA-256: c478163e8dff7e9d51366f84d0ccf77043788de44a382ff937ac6128d144b6d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and the 'disposable link farm' heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=wpa2+psk+hack PDF link annotation
    • https://bosgo.mn/uploads/files/kodakonibekog.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/wixifilegore.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/radavilazunuzalejudufu.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/36001437782.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/ponezorivokoxaf.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/40727045716.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/wifanadano.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161364a6788d33---91734689769.pdfIn PDF document text
    • http://riph.pl/userfiles/file/xireji.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/42523107358.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/53158812784.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/ruwomalimumafavax.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/47219988747.pdfIn PDF document text
    • http://yuanfuconstruction.com/ckfinder/upload/files/56310298031.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/53414280937.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/1752556798.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/xuguvel.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/64452578425.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/faxaz.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jedazuzat.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/kifexiboduxumujogot.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/golanaxabisazesedaveg.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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 18132 bytes
SHA-256: fe9731becb599ad85ad6b50187a556f79fd07c6551afe452cc8a599001fd8629
font_02_sfnt_off00013e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1F 9984 bytes
SHA-256: 950aa106973e0b326a8fbb5b01e03dcd2637a27c6674f8a99594348fde13fc9c