Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aff7c18f72700ae…

MALICIOUS

PDF

79.1 KB Created: 2021-07-12 22:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4e9189c840bf3e06646b35f81a70216 SHA-1: a7f28bc81a50695b3a46cd203f64e553361b6325 SHA-256: 8aff7c18f72700ae78405ca91ad06575113746ae6ece6d018b5d30e2b17b7da7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by a machine learning classifier and ClamAV, with a specific detection of Pdf.Phishing.Trojan. The presence of embedded URLs, although many are marked as benign, suggests an attempt to direct users to external resources. The PDF structure itself contains anomalies, such as duplicate object bodies, which can be indicative of malicious obfuscation techniques.

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://feedproxy.google.com/~r/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=shout+out+meaning+in+snapchat
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7e1e8f29cd6423db4aa69/1625809384086/how_many_years_back_should_your_resume_go.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c7e4c3dba77ad335b1d0/1625868260668/first_and_second_cervical_vertebrae.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8d8a90a3fc495319f73c/1626115466153/construct_a_frequency_table.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e92b5f37cb904475605427/1625893727792/what_is_a_spider_eye_used_for_in_minecraft.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8b09fe047727940c6ff4/1626114825350/anti_federalist_government.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e633631fd4ab816ec06/1626115683667/impact_of_unemployment_on_economic_growth.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e95fb1854c1d3b34889822/1625907121278/zeguxovodikad.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d09e1d90976278a9e3fd/1625870495093/jorewidajikowuruvowabavam.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec90e7f91837287387d989/1626116327639/buwofumisafudewi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8f8cf91837287387b2a5/1626115980519/purchase_and_sale_agreement.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_off0000d6b1.bin
80bcd8da4acff58b829a40374d84fa3d30913c035f2dcfc7b796bc028de6a8fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 10852 bytes
font_01_sfnt_off0000ef97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
font_02_sfnt_off000107a9.bin
cdd0bf339f549b02eea882bc614f4664a0c3e6ba65f22df7988780aa030b2803
pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 15868 bytes