Malicious PDF — malware analysis report

Static analysis result for SHA-256 03282a1cbae14e49…

MALICIOUS

PDF

88.1 KB Created: 2021-05-15 11:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d8d4c3f734cdc0879fd7e424e252ff2d SHA-1: 9b3b3ad8ed1f219229c5c8856435a391f4b9a86a SHA-256: 03282a1cbae14e4927d5ef2f629ec98b4560b08f9f643cfe1c5830c813e676a4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=simbolos+diagrama+de+flujo+pdf PDF link annotation
    • http://vajesafosedepur.mywebcommunity.org/49995008320.pdfIn PDF document text
    • http://govitus.sportsontheweb.net/sintomas_de_candidiasis_oral.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_6038d0c5aebe1.pdfIn PDF document text
    • http://jewogipuwivi.medianewsonline.com/college_botany_textbook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_600eb9b129a4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_d419620733ef48378a45ec48d179716b.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_8da28031acc245e39c90a5f291119d33.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_8ebac8e65adb4b36817bc9ce8a350749.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/2504952910.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/jebatekef.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/18887776332.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/87786193290.pdfIn PDF document text
    • https://9e28b13d-ef5c-4d18-821e-e071a8932918.filesusr.com/ugd/0b0738_393e84c48094434ca5adb7e95713f9f6.pdf?index=trueIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_802e2a9c2ce5469b9b4e3f8524b93761.pdf?index=trueIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_9906cb1fa1f8409d979e02fc9479a3d5.pdf?index=trueIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_bd69b97a88d24c3c907502e0f88319df.pdf?index=trueIn PDF document text
    • https://97783159-ced7-426e-9fbd-60d2bb3342fb.filesusr.com/ugd/00058f_b760a253359f4a63acd5f7ec8daedc17.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_730c8a85fd4c41bd9faff068c8cecbe9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexeliku/business_invitation_card_template_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/87367009161.pdfIn PDF document text
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_6c34e1fa19bf4415af03a0fab334f5bc.pdf?index=trueIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_5e0f28c8fc6849d1a4be3da9901b92de.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 5680 bytes
SHA-256: cb1f3bbacc7988e8e66683e3b70eb41636f8377995f87371fff6d3a17d96f89a
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 12444 bytes
SHA-256: d19947c432eb15ad1640af4c938fbb51894e3618d65e3605db1eca57a4b84d8e
font_02_sfnt_off00013bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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