Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a5cc49b663d23e…

MALICIOUS

PDF

72.9 KB Created: 2021-09-12 20:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 085293a8a6ea7dea52caab066a4e5d4a SHA-1: 1db6f9565f2ff76c0558a33d017aa24105140ce6 SHA-256: 99a5cc49b663d23e95e7e813ba425e37788ee46244a97931ebbbe40d6fc2ba67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating it functions as a link farm. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_URI' strongly suggests a malicious intent, likely phishing or malware distribution. ClamAV detection further confirms its malicious nature. No scripts were extracted, but the structure points to initial access via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=top+gear+rally+2+n64+rom PDF link annotation
    • https://gregoryshow.ru/files/file/duwepopi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130da18d08f0---18168974017.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/94999746693.pdfIn PDF document text
    • http://simoncaulkin.com/images/77081231716.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/gakijolizutabababapiwuva.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/xumiditojexugoni.pdfIn PDF document text
    • http://benetalent.com/upload/files/45316217470.pdfIn PDF document text
    • https://umutfm.com/resimler/files/40708621863.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/17759576304.pdfIn PDF document text
    • http://xahuaheng.cn/userfiles/file/64335786477.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/12123238988.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/vukov.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/74753063637.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/temalevudaxu.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/56706141981.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/67122642673.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dodutedem.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/19351026949.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/dananitijozasijuladeroz.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/99497507255.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/19156721919.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/68362399802.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210906_03011807171D3B9B.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/xavirokotudifudibelarefar.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/62035327624.pdfIn PDF document text
    • 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_off0000bae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE6 10680 bytes
SHA-256: d282cb5dc59427e37906a8a4d52ef2b4d31edea5725882a670f3bc3cd1c40294
font_01_sfnt_off0000d381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB93 15980 bytes
SHA-256: 59c04ce0ee48999936ae1467e84ac0d5240262b84cbd5a017066e60f572d505a

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