Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a5bcbb8ee9a11c…

MALICIOUS

PDF

75.3 KB Created: 2021-09-23 07:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11cdb38f600a1a722f8fde0838602b2c SHA-1: 9c126803a0774e60e4f60981dc6df6b67b1bdd1e SHA-256: 92a5bcbb8ee9a11c7ee1c5722d50f293d87ef9f99772371a29a4a823dbf1169a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple PDF_URI heuristics points towards an attack pattern involving external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614634b1b59b0---79795296689.pdf In PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/buzofosewixikilidilo.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/47227315904.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/18047774598.pdfIn PDF document text
    • http://medrea.ru/upload/files/59777893378.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/josinidodumi.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/pexevavizaponepif.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/wemozanexalekarofaje.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/luburegijinozixavuvopezu.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/jovebudekafega.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/52341660769.pdfIn PDF document text
    • http://www.siposferenc.hu/html/duzupi.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/fojabotazulomifodorej.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/mosusodilivinewisuluvuxap.pdfIn PDF document text
    • https://red-adlay.com/upload/files/29312203349.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/vetilorizekujafak.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/26047553416.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_3AB91CB7CECE1016.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb94e2d170---23341881446.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/zukenoseviduvaxeronuze.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/71030544355.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210902123832_mryy93.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/73188690528.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/tojijedetasijev.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/71309216560.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109221730246936.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/3488552079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=supernatural+season+5+episode+6PDF link annotation
    • 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_off0000c3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F4 10860 bytes
SHA-256: c48eee881010f88c2fa34f9ceb1e9dd7a49a14c517f9c0f800a1ce95e23ccb09
font_01_sfnt_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 16424 bytes
SHA-256: 704d7b2d0d2b7d4633e06be4e43d2097c9440508d36dc85b8b158174c22d063d
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1