Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e63328a212ecf…

MALICIOUS

PDF

81.9 KB Created: 2021-02-17 21:07:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e14b67990f18e2cd091cbdab76a8f046 SHA-1: fe8bff12d921dccbdc401a2721c76700c5640e01 SHA-256: 821e63328a212ecf0c319e973b74f8d516ab0a4fe6f4cef0823329a6d931e41e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'jottigo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://jottigo.ru/aws?utm_term=ap+chinese+barrons+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4528260/normal_600dddcdc18ee.pdfIn PDF document text
    • http://regifugujuvu.iblogger.org/74913931236.pdfIn PDF document text
    • http://sojuvofud.22web.org/endnote_7_for_mac_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491439/normal_5ff7c328ddc87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375076/normal_6011f1e9996fa.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/34FNTEI/72305971446.pdfIn PDF document text
    • https://cdn.sqhk.co/zanaforare/8jajghf/70073733613.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/zmgjIp3/lurubesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5ff9a611035f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fizudojaxabite.epizy.com/component_2_eeo-_1_excel_template.pdfIn PDF document text
    • http://bixodog.rf.gd/uwa_celt_application_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 5404 bytes
SHA-256: f3039f014876b27004ef651fc9c5237f2aa555d4d5adc72ad1f73e3cf4f38ab7
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 11444 bytes
SHA-256: ab644a9f916c7a78091059473c17402f53e4a327ea2f42a7cfd2d71cc62a383d

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