Malicious PDF — malware analysis report

Static analysis result for SHA-256 987500117fabf8e8…

MALICIOUS

PDF

98.9 KB Created: 2021-09-18 04:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 773f6cab5529acbd3f5eddc1378c5bca SHA-1: f659665f94dbe5bb7965b941ff3e464a30031943 SHA-256: 987500117fabf8e8fc0972c494029e4b09bfd454c75a731145b3f0dc79daae71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=resident+evil+8+village+android
    • http://innotack.com/userfiles/files/tebadilanisamud.pdf
    • http://szilasfood.hu/pic_upload/files/dotem.pdf
    • http://yarpb.ru/pic/userfile/fazugikepogofe.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gipivakimexupi.pdf
    • http://malagi.pl/user-files/fck/file/levorox.pdf
    • http://permanentnimakeup-brno.cz/userfiles/files/wagudavet.pdf
    • http://bippex.com/filespath/files/20210916195116.pdf
    • https://a2designbg.com/userfiles/file/59000120908.pdf
    • http://adveotec.com/img/file/roredupozar.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161300d4e76682---69525968413.pdf
    • http://33podarka.ru/pictures/files/29802761622.pdf
    • https://doan295doson.vn/namthuan/images/news/files/81274293934.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109112121115694.pdf
    • http://lonniestireandauto.com/nbloom/fckuploads/file/lupekefeseveruboki.pdf
    • http://brukbet.com/user_images/file/74766689607.pdf
    • http://emilygrilltogo.com/uploads/files/maduvorujovadezajepe.pdf
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/2008514755.pdf
    • http://15881588.com/ckupload/files/julejubipekexopomepa.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16145281a1f13b---12320947543.pdf
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/98855432791.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29051403175.pdf
    • http://girlstown.org/files/js/ckfinder/userfiles/files/nisedukenepifowa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011807.bin
e352fc2b61c7cffe32f1f6c48af0fb25303e1187b8da2f80e1fbede88ca9b620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 20492 bytes
font_01_sfnt_off00014d51.bin
16d25760f421d71e8d55b1f297e831df180d12e85b505a320bb30003cee43434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D51 10744 bytes
font_02_sfnt_off000165fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x165FB 16792 bytes

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