Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e7ab924d450401…

MALICIOUS

PDF

88.7 KB Created: 2021-09-17 03:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae52b81d259d5728199a1376bba4e9b9 SHA-1: 7f1d194a5b8247b0ba0dbc7454907eb409754996 SHA-256: f4e7ab924d45040100586de53169740d17959cc97c7e8fe9715416016e57d04d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to redirect users to potentially harmful websites. While no scripts were directly extracted, the nature of the heuristics and the embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://5ky13lu3-1251.com/contents/files/faledevufudokosake.pdf
    • http://skybuildinfraprojects.com/uploads/94272132100.pdf
    • http://ckm-machinery.com/userfiles/files/75011785451.pdf
    • http://elskup.pl/images/assets/file/37727087973.pdf
    • http://budoprojekt.eu/obrazy/file/fifibemeretojejuz.pdf
    • http://offerseir.com/basefile/offerseircom/files/fokofiguwozazewu.pdf
    • http://montagnobozzone.it/userfiles/files/bomibekibajakobazulam.pdf
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/10707362197.pdf
    • https://conrays.ru/f/data/80657364492.pdf
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/32065220660.pdf
    • http://sun-eko.eu/files/file/lubofigazejama.pdf
    • http://pileshoppen.dk/userfiles/file/balelewavekitoxokigozibaz.pdf
    • http://jenan.com/ckfinder/userfiles/files/74352615316.pdf
    • http://stphilomenaonline.org/userfiles/file/7043266715.pdf
    • http://marthomaiticherukole.com/userfiles/file/finomutemezos.pdf
    • https://pastelbuilders.com/userfiles/file/48104909655.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/pexaz.pdf
    • http://iberryhomemade.com/userfiles/files/wovepibimexivevawivo.pdf
    • http://titishop.co/upload/files/rumokamenevok.pdf
    • http://www.parkwaytransplant.com/media_upload/upload/files/kenepojarujoni.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/kowikixesazebenepur.pdf
    • http://dichvuhangngay.vn/uploads/image/files/1269229998.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315ea8e7ca1---nupekomamujixi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+latest+movies+online
    • 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_off0000f842.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
font_01_sfnt_off00011059.bin
bcb311aa70a824a70507c73b1fc37111e0d8bc514289d082f9f1b64162ed7e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 10452 bytes
font_02_sfnt_off000127f1.bin
0222ea038e20cc0f7e1fd7190485d147c52095efccc938f7fe1b8ec2dfdeefc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 17596 bytes

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