Malicious PDF — malware analysis report

Static analysis result for SHA-256 a833f9a2a2d3087c…

MALICIOUS

PDF

78.3 KB Created: 2021-07-20 12:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82990780d2795d48aab3f03bde0d6e1e SHA-1: eecce69ca43af28660ee171f0b46931376953087 SHA-256: a833f9a2a2d3087c4d123861a1778738f3969bd0ec9faf0afc2e903b74783542
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/square?utm_term=horse+betting+strategy
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f4358d5f13a15bd827189c/1626617229651/total_curved_surface_area_of_cylinder.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee815f7c5bce1f3350d375/1626243423690/60662358505.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f26d01a047b636121b6da3/1626500353547/36289757082.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e46e83ae0c490235d475/1625875566653/poly_supranuclear_palsy.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd558e83f616bcf81ab18/1626199384803/cobol_complete_reference.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0213336870d1a2db8bba9/1626349875540/viresufomixuminikepi.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5e7ff7f1f2a52af75f76a/1626728448008/morotonaxalinosepujuf.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edc8f7a9d1f62037e07455/1626196215709/27548334797.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee5df00b33b63bb8c81530/1626234352558/jibugutawetimiguxow.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f5638ab282b304dad3f50b/1626694538598/answers_of_the_road_not_taken.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ff.bin
ad94066a44ef0f6841cf07b748b5f9f39e9bd7c37f21e832fe8916a3143dbe86
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 10484 bytes
font_01_sfnt_off0000e9f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
font_02_sfnt_off00010207.bin
2e547bf812db85f36f9a120c5a39c677230f6cd478f4db8d6bfbe25e91cf58fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 16592 bytes