Malicious PDF — malware analysis report

Static analysis result for SHA-256 b354974a7d781f4d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 12:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 583dee88588b9624cdd87e9bdc112763 SHA-1: 805f9549a94098eb20b6659e90073de80b5b7b03 SHA-256: b354974a7d781f4db234c214e3ae5a939e149d624ffa2aca877ebd4618061b43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, suggesting an attempt to redirect the user. The presence of PDF-specific heuristics like PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5242

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://queure.ru/uplcv?utm_term=nba+mod+apk+2k20
    • https://dnm.tw/uploads/files/202109110115515050.pdf
    • http://voszveszprem.hu/_user/file/36335938575.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/75057903078.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd8e721f44---vagevelu.pdf
    • http://maskaevlawyer.ru/userfiles/file/simitogibafujerel.pdf
    • http://rkenterprisesonline.com/FCKeditor/file/nirosirozatesejemanoka.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/78174129662.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb1397aa8---67764531645.pdf
    • https://efnnma.org/files/file/nogulasavuzatinebawenuv.pdf
    • https://tecnicadovolante.com/images/file/14063775495.pdf
    • http://stroykap.com/application/views/stroykap/userfiles/file/96093842287.pdf
    • https://marwaservicecenter.com/nbloom/fckuploads/file/74205469334.pdf
    • http://galettedesrois.eu/userfiles/file/ledesanidipivife.pdf
    • https://perfectprojects.ro/userfiles/file/bafevunaxe.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/kinaj.pdf
    • https://www.adoz.cz/ckfinder/userfiles/files/43090486497.pdf
    • http://bftt.marketsearching.com/upload/files/61514145313.pdf
    • http://krupongs.com/images/file/40690878588.pdf
    • http://ieeepes-thailand.org/app/webroot/files/files/56789928058.pdf
    • http://fiumevivo.it/userfiles/files/buvixiw.pdf
    • https://nezamirekhaseafoods.com/userfiles/file/susifuwomivamopuve.pdf
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/12415215815.pdf
    • https://2winit.com/Files/files/sekiragomoxalakukir.pdf
    • http://mikailang.net/userfiles/file/20210909160806_73525576.pdf
    • 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_off0000b3ee.bin
9879ab248e32371da9b40a9e3549ba1edb72425272e55ff05275248a0cc7b25c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 20140 bytes
font_01_sfnt_off0000e77d.bin
3e5031c928d4d836a0987da6c8180c57d7fbed0c225cbf1a3c5228e18858b85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10264 bytes
font_02_sfnt_off0000fe5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 16792 bytes

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