Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2161bf853588751…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 05:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cf77fa240888a153b18010d542db3ecf SHA-1: e606cda27754f8416a9953f9fcc0935d1f04242a SHA-256: c2161bf853588751229565b765c89f99eb5125eb6e2f8d92c70ba2770119ca9e
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URL that points to a suspicious domain, likely intended for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to ISO 27002 standards, suggesting a targeted phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=iso+27002+version+2005+vs+2013 PDF link annotation
    • http://kevarusakoko.mypressonline.com/pdf_marketing_management_14th_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5fe45d7aa9c01.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/first_law_of_thermodynamics_solved_problems.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5ffaa64070fbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_60359b62e3e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_604302da9ded2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_605f6298aabdc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fdda2d0cc25a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rezugekolaba/61987590776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e402c517-f1dd-4289-8f1f-6a28e1aa59ee/why_does_my_brother_printer_say_check_connection_when_i_try_to_scan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d3f9da-3183-4f64-ba85-551ecd4ff0f1/27622608098.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/kutaxevexinonavajefuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad87b5f-ec77-4a05-aca7-55b5c715dc85/suxakajutulokozus.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/gewanagen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b489141-d9a5-488e-af66-efa64f39ce95/who_is_still_alive_from_gone_with_the_wind_cast.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA98 4836 bytes
SHA-256: 304e9d47d934a2fca641b9fdf265c161b6cd8b23c00d0d66f975a308013773a6
font_01_sfnt_off0000fb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB13 10348 bytes
SHA-256: e19151ad084fdc0a4963a086ed48773ef49ce134fba09d7070f873baf8c7b963
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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