Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2b9f9cfc1db366…

MALICIOUS

PDF

116.8 KB Created: 2021-02-26 23:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 640d7e565f0c9a857f25a080320e4bee SHA-1: 2dfbb1a8dee61a5f1080ac3910b05f9a4a024d5c SHA-256: 2c2b9f9cfc1db366019d6a034dda01604be1b7adb83a55bf1a1fdf49f72ae224
156 Risk Score

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 0.9996

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 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://crophysi.ru/wix?keyword=%25D9%2585%25D9%2586+%25D9%2588+%25D8%25AA%25D9%2588+%25D9%25BE%25D8%25AE%25D8%25B4+%25D8%25B2%25D9%2586%25D8%25AF%25D9%2587+%25D8%25A7%25D8%25B3%25D8%25AA%25DB%258C%25D8%25AC PDF link annotation
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/wuxofidelizob.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/jbKgdif/hungry_shark_evolution_cheats_2020_ios.pdfIn PDF document text
    • https://jumegelizo.weebly.com/uploads/1/3/4/7/134712838/6019693.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/gWA7iiD/mma_manager_all_talents.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/866b25222.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/2e05ad.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/LbgfihS/40073272066.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/1795645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vexabimumemig.atwebpages.com/diablo_3_crusader_builds_xbox_one.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/jack_lalanne_power_juicer_lifetime_warranty.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/bonding_and_vsepr_shapes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/dukobiw.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/adjective_worksheets_for_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/suveritibefajebonuv.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/china_tourist_visa_application_form_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/46460808865.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00018b15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18B15 31376 bytes
SHA-256: f4d8a60ed1d4c618a2ec06a28852742c0c55175d9113c9c72d19b2ad2e3fe6fe
font_00_sfnt_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 4068 bytes
SHA-256: f7be38b2fa677f6ee1dfbb51eddb29e820abac98a6373e955bcd68c0e7d00741
font_01_sfnt_off00014b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B95 10260 bytes
SHA-256: c4710c752d042d4fd9fb9c738430edaa8946ea8274ad80d1a2bd9251599e4cf3
font_02_sfnt_off00016eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEF 18216 bytes
SHA-256: d2ee8b17b61447b6ae6a2d70e85e4c3e7917104076f3a4c8009b15187e6f094e

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