Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d7a773533bfe6d…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 02:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 743943997ea0d28ccad34989850a365e SHA-1: 7c318501b6ea7bf39ab24f58200d128192947b11 SHA-256: 50d7a773533bfe6d092e9fc62c87a5c6a7cf40dfb944a0134f27c77f5b6ceae7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URIs, with at least one pointing to a raw IP address, indicating a likely phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate effort to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=youcut+video+editor+app+is+from+which+country PDF link annotation
    • http://hyunshin.net/userfiles/file/45897618589.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/sokibixigumakabuvori.pdfIn PDF document text
    • http://selidbe-beograd.info/files/95509614515.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/detutesakasijabobirowov.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/81868420724.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/31411015196.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c9b78c700fde6ab13a3780c07b4b216b/morujefudawomebenip.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/lavomulaxovogojutase.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/rapud.pdfIn PDF document text
    • http://art-ball.net/files/file/tofapenasedulaw.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/mezif.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/kufazovepiref.pdfPDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/44529242915.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/62ba4bc6dacba3b376ec9bc6d93b4122/peruvumal.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/2513678657.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kelisoxubobodara.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/surazisidux.pdfIn PDF document text
    • http://landpas.pl/upload/file/diwev.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/63037299568.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/73578745266.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210907153408.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_off0000d1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 11188 bytes
SHA-256: a5f8061ac8269e70940e0ceeb9f956b0ccfc3ddfad297db450303b3a35407521
font_01_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 17348 bytes
SHA-256: 2f3a8045edb91cab4c20b5a9a117abeb654beee5cfc786d7589103548d53c850

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