Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5afee905172d4d…

MALICIOUS

PDF

84.9 KB Created: 2021-02-05 00:31:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 650ae22d3d91d290ffb00ac23a6ddff3 SHA-1: de6cf69b1c4ec24a9a24d883fde920b5cfeb8884 SHA-256: ec5afee905172d4d23ba2a5a03f6bf59e5a734ecf1965c54fe6fa70d61d439a3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL, https://crophysi.ru/123?utm_term=samsung+bd-c6500+specs, which is likely the primary vector for the attack. The document body is heavily obfuscated and unreadable, but the presence of the malicious URL and the detection signatures strongly suggest a phishing or malware distribution 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://crophysi.ru/123?utm_term=samsung+bd-c6500+specs PDF link annotation
    • http://wajuxerisowo.iblogger.org/addition_and_subtraction_worksheet_within_20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471275/normal_5fee635de6596.pdfIn PDF document text
    • http://siankaanmexico.com/riwalowuzamaninaweniolphf.pdfIn PDF document text
    • http://milanomoda-italy.site/amway_atmosphere_skyl1xli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_5fcb386446832.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/76056848013.pdfIn PDF document text
    • http://rafetomobu.rf.gd/simple_present_tense_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/70149247639.pdfIn PDF document text
    • http://xinudekewukipi.rf.gd/wifigude.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/93573383760.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/gems_of_war_noob_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/97751713269.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/arionfx_for_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/fukoboromezagudil.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/cisco_2140_firepower_datasheet.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_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 5960 bytes
SHA-256: c982659c69332bd191f8319cd71b89e99930a8a0831dd98b667fd46eaaa463e2
font_01_sfnt_off0001202b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202B 11356 bytes
SHA-256: 130d9e34ba4c2cd4db710337a2db6ed82ba3fa1c0b9ad92792d7eaab1bd5929b