Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcc6e12b496b839c…

MALICIOUS

PDF

72.2 KB Created: 2021-02-26 01:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c507319595a22218213420f15232309 SHA-1: e9139cecdd7b3e41621387bbfdd9db228deb47e5 SHA-256: dcc6e12b496b839caec8e753d89a41f6a02ce5f53e6f1cffe2207e06fbf00850
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is likely intended to trick the user into visiting a malicious website. ClamAV detection and ML classification strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=food+web+worksheet+answers+biology
    • http://pet-guru.shop/how_to_use_onenote_2016_for_worku01dd.pdf
    • https://static.s123-cdn-static.com/uploads/4367650/normal_5fe55cf3c7a5b.pdf
    • https://static.s123-cdn-static.com/uploads/4366628/normal_5fce5cad96e69.pdf
    • http://afracheat4.xyz/929716792310xths.pdf
    • http://mkr-olimp.info/adjectif_apposeb7el.pdf
    • http://tupaxeguna.scienceontheweb.net/three_major_criticisms_of_differential_association_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tapoloferazuziw.atwebpages.com/86328161950.pdf
    • https://s3.amazonaws.com/bejideba/columbus_dispatch_voters_guide_2019.pdf
    • https://s3.amazonaws.com/nitizobuv/wezotulo.pdf
    • https://s3.amazonaws.com/lekezaru/asia_map_outline.pdf
    • https://s3.amazonaws.com/xalasawu/colored_tissue_paper_sheets.pdf
    • http://zevusup.atwebpages.com/28248028106.pdf
    • https://s3.amazonaws.com/fuwawibu/oceans_hillsong_united_piano_sheet_music.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de07.bin
c448d08a659354d4ef4f65bc75fef62757dc7d28c4f5b7fee683b91fde1a02d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 5440 bytes
font_01_sfnt_off0000f09b.bin
f70c1577aa25dfb93b111eb0f84c23a4c7dbfba35b3094b00c075fd1198f2d5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 10504 bytes

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