Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8feb8771b0e6fb…

MALICIOUS

PDF

74.8 KB Created: 2021-10-11 03:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b045ab3d1494ab1931ab30820204581a SHA-1: e4662233d8b4772223033b514ab295ee6016a803 SHA-256: fe8feb8771b0e6fbb476fed29bc35e7c561db2e309aae22204b8cbef9f4b737d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. It contains numerous embedded URLs, many of which point to PDF files hosted on unknown domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, a common tactic in phishing campaigns. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an intent to redirect the user to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nedimgame.com/calisma2/files/uploads/71649953351.pdf In PDF document text
    • https://ww170002.linebot.net/upfile/files/20211008082749.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/86646018858.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ddd96ab553d92ba3b85b38d3cdd5d0c8/xavotugatofatopos.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/zijur.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/59000561695.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/kujegizorupe.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/soriponedukoku.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/69388876516.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202110011702580275.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c38f516079aacc13df2262fee8d54408/47595477676.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/jafepumexosedazojusej.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/28412871615.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/jomelibajefaroxorupu.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/58775599446.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/nutevojupim.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021092400173012.pdfIn PDF document text
    • http://wamer.org/userfiles/file/23473946442.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210915_202326.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/japizotuwa.pdfIn PDF document text
    • http://goodbox.org/uploadfiles/files/20211010_060341_8051.pdfIn PDF document text
    • http://philipsphotographystudio.com/nidixevurawiwofe.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/46362265153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=woofs+%26+wavesPDF 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_off0000be2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63C 20072 bytes
SHA-256: 9652ddf25230277439fa5d11d516d6bdfd077b805780a1d362915328f4ac1cf9
font_02_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 9460 bytes
SHA-256: f88f95299faf6c72613a6a3da7a4f1b471446fb235b998c0572fe68d4d93e0e6