Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f307307c430cf17…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 14:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91fce19ea60bc6c962649753760722f9 SHA-1: 975557357a8992bcd488756d6276d7556a450593 SHA-256: 9f307307c430cf17a007e5a2735fba8fb3226fd000ca7126c69119207ced2d83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF 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 unknown URLs suggest the document is designed to redirect users to a network of potentially malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://schokoladenbrunnen.de/idata/29663421807.pdf In PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/52280433253.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/69hhfqh03j9kp6i111dpsq05h6/16356629769.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/veruwasedinukedopawuvipax.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pojuvo.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210913194719.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210906092952_Nzg5OTk1MTcxMzU=.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/54679072597.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/7947471815.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210911223155.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/74644831472.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/73022181709.pdfIn PDF document text
    • http://zenkatsu.dk/files/giduteto.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/milufoxotevimateviwiko.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/maxivujegijelabifu.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/mufipokorajuvupomevedin.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/9983762414.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tetaremasuritopoludalixe.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/vaxofukigafu.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31867420308.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/zizesofazazojomiwipat.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10b764aa5---ripopawilaragifaridu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=demon+slayer+season+2+dubPDF 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_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 18312 bytes
SHA-256: 991d687b3f5a4056d6894a77c7519106bbb40659336e0e345258a5763f811a23
font_02_sfnt_off00012490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12490 10696 bytes
SHA-256: b7e8f8a0dae14fecf1a4ac4cd60f710f606dcdefa6bf329df938ea2a34afd5d3

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