Malicious PDF — malware analysis report

Static analysis result for SHA-256 92aa222607649e50…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 15:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a874e5402a83b81e68c582bfb5a7b963 SHA-1: a5aba570fe70b7d42fe87d589383a4d3a14e5e8a SHA-256: 92aa222607649e50569c1f35b6b545e5ae570502b1e0a1a9a64182d5f7bb3b0c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a large number of links on disposable hosting, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is used as a lure to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=printable+spell+sheet+5e PDF link annotation
    • http://timnhanhonline.com/upload/files/fipasaxupumuropeboxibox.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/26666642357.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/56758803024.pdfIn PDF document text
    • http://decorstore.eu/upload/file/49804630222.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/29e77d377052886ca5da57f0a07954ad/88682081933.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/xulek.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/50975801531.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/83384661435.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/74582879799.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/2889092274.pdfIn PDF document text
    • https://nls.vn/upload/files/10360588314.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/dogajedabi.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/89090930475.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/62184707240.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/zomexavexipevodevifimas.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/modaworuzibeta.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/jukozobakejijuzunusakud.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/43413164066.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jupelemitoja.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/tolorajuzenomexe.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433599ebdd7---65579245680.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021917550307518.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/binexedujisipukifop.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/15959277135.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 18920 bytes
SHA-256: d2534ff16b75c58ae825040d90c23e0a3de483c4b8d88c3c9d5d9ae70d93a5d6
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 10504 bytes
SHA-256: 502c7a5cd2cbb88a58c1cb8281cfc20df5e69b837153dc22d3d09deab4917162
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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