Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27bb111a60dab57…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 16:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 648be9971bd979352fd9497cacf7780d SHA-1: 8e27b9e03f367938a5665274450b825c3bc77624 SHA-256: d27bb111a60dab57d40b30fc17dfff2257d64d73e7ad4b4cae813bdfd0a6ce5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://gld-lining.com/user_img/files/kuzefadikeropijane.pdf In PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/54869757870.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/razigarenen.pdfIn PDF document text
    • http://millionsdiscount.com/mo_images/files/kaninupot.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/pigufatujaxon.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/36661604665.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/16657777836.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/jetife.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090417352373499.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/medadusigitur.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/vegelawarebopiwuwexa.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/7164996423.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/84849764098.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202109027200_1065841096.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/38004637185.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/lokajetex.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210906_6BB1438DD34A9057.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/86164092776.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4958ecbc---jefajuwafarixagolemurof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f960ca95e8---rewewur.pdfIn PDF document text
    • http://koala-al.com/d/files/74935370245.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/wutupo.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rawevofuvuwavelugab.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/67348590098.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/89267247793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=resident+evil+village+free+download+for+androidPDF 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_off0000d954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 18296 bytes
SHA-256: 5cf0ab6cdc38bc56f137fe4d451a8089fa323718e2093604aa6e40dcf111195e
font_01_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 10724 bytes
SHA-256: 0520694d75058629b800b0dc38373c057c157009b3e4a263a71b8833c791a5e8
font_02_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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