Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45dfd8aea7b4610…

MALICIOUS

PDF

72.9 KB Created: 2021-09-26 12:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 208bdf1f4887a0687819d33397f3af45 SHA-1: d19377203b77584798b1ce3b8adcd820593332f5 SHA-256: d45dfd8aea7b46106f6a66c8eaaf81aa791caa62267a0c5ff92e5d04b38ffea0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://queure.ru/uplcv?utm_term=nba+mod+apk+2k20', suggest a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://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_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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