Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ae1d6c3bf97cd2…

MALICIOUS

PDF

88.3 KB Created: 2021-09-11 17:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa24b5efaf6488d954db91fdfb3940a1 SHA-1: e41a956a02059cb9779c27a9b7ff675644b80385 SHA-256: a8ae1d6c3bf97cd2146ed8be771f1665ea00d057d9a2b6b42187910597b1b1fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the overall detection points towards a common PDF-based phishing or downloader attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://archism.ru/uplcv?utm_term=tales+of+moonlight+and+rain+pdf PDF link annotation
    • http://heatherjansch.com/ckfinder/userfiles/files/fawasagozabegu.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/padukoked.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/5598602882.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/83122132227.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/85378295323.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/wobureguravomanurajavoden.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/83378346913.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/366962570ad4ccacfa7e2f3ee753d4b7/bigiwalijokinajomufajin.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/xitunumawekuvakanafemi.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/jepiku.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/25135772267.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/9830001409.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xedijuwujuleduzexo.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/16036978426.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/5640130007.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/99214745522.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/78525564852.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/segikosokagizazude.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/marago.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/gumelogolare.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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 22576 bytes
SHA-256: e4a8b30c9c5d71e713d7ef307442f14bf4bf3fb7c19db5947ceace0b8a885b32
font_01_sfnt_off00012343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12343 10908 bytes
SHA-256: 248dd4df1e25679ad52df70a8889b3df65d218bdd089a23cbe38c1cf3eb203d2
font_02_sfnt_off00013c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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