Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e782c42f46ccecd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-10 14:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b21632300f2d2f8d4b18e6f42a93e91 SHA-1: ef5a65a57b878a1ef4d8aa714dfcfa7d793284ec SHA-256: 8e782c42f46ccecddc278a2a23b8a1ac59bd975a260b72fa2945710bd0c76b8e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=best+ui+library+react PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369de064d05---vofateduk.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/25842016359.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/70565714478.pdfIn PDF document text
    • http://vanhacollection.com/images/files/dodapoxosofod.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/fetidijomag.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/61220245606.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/43846952159.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/putofopukigazusijux.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/35343496503.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/84964410377.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210904035304.pdfIn PDF document text
    • http://hrudolf.com/userfiles/61488194463.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/15740471489.pdfIn PDF document text
    • http://apvn.info/userfiles/file/21040491207.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/57976421477.pdfIn PDF document text
    • http://symbolfoods.com/files/file///romapurozino.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909140546971686.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/69395563161.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/55330498837.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_133627.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/15046106108.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19707747808.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/dexomexalipamelivexexoma.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/24200948005.pdfIn PDF document text
    • https://tigapilar.com/upload/files/85027152238.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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA04 15056 bytes
SHA-256: c70ad7a425cc1a16f2d43c1e9d0d7704beb8317d92bd402e991515705a1cc07f
font_02_sfnt_off0000f00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 10408 bytes
SHA-256: b7bb8f1021cf3c20e0ca1ea9a994b1998dfe59524d8007c873edcaf68c51c133

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