Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa03caf39d48a23…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 17:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eb8998020e005bf68a369009274eb5d9 SHA-1: c045c4f5f2ab81511fa8be64b1beb1ffb400d3b5 SHA-256: ffa03caf39d48a236b112c8232679997cfb3f65d1d27b0530d1d51f26cc82026
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the presence of multiple unknown URLs points towards a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://asja-doll.ru/userfiles/file/mimofit.pdf In PDF document text
    • https://konyaalotaksi.com/userfiles/file/xirixazapomiramizijufo.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/45752065977.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/98799804822.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/13104505687.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210910_193854.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/47767447471.pdfIn PDF document text
    • https://anup.bo/images/files/61660695539.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/46029290084.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/molepeg.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/91755237050.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/giburezajexogasimugurat.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/89641794460.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/tikeviwiwipavekozezo.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/ginukobunuzidizetejibuwol.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613287a78ddc5---48026349391.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kaxusum.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/luvetetexafigagonadiw.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/33911127876.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/duredopabepixuvafasa.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/37077638651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=blackpink+light+up+the+sky+full+movie+online+freePDF 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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 22448 bytes
SHA-256: 1417fd4574d14008e9a1ac596e52b757476875b96957b737280ec7437deda390
font_01_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 11352 bytes
SHA-256: 4837a281ae88c1e1f3884b1e572ca6908bc9a157dcf85d117331371ee45e9b66
font_02_sfnt_off00013fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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