Malicious PDF — malware analysis report

Static analysis result for SHA-256 583dbe8343964e93…

MALICIOUS

PDF

79.7 KB Created: 2021-09-13 10:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: bc0cd4f861ee1300e34530d62b3797ce SHA-1: cd8417f824c9dc8778550d41325b1184ec64a8d3 SHA-256: 583dbe8343964e93c5be55aaa577783658aa0bf9ded1d7586b5806960663e04e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://garglob.ru/uplcv?utm_term=how+to+remove+boot+logo+android PDF link annotation
    • http://webursitet.org/Files/file/35655249399.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/92441839945.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/gukulabinejevatexatage.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/45842142609.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/69163312421.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a529bf1276---72201949460.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/vasurozonudaxilosetibo.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/45157850096.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/4672618465.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/15809659756.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/39167848077.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/54555386114.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/jadibiwafikofoliza.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/68524653669.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/porose.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/20266912590.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/16474659435.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/54739938436.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/wifivakikeluwojum.pdfIn PDF document text
    • http://maxbrio.kr/files/files/zafagejofijososunosotizo.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/80321767822.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/82013700299.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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17888 bytes
SHA-256: 06b3c2f8cb503365b7921e76f8260fce681dc19bfdab6dad668a7ecf2722aa61
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 10704 bytes
SHA-256: a419f3e80954fa7d0a49cefc965a550acf431cca2111a6a9c7909d5c321609e5

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