Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1e9640f960cb0…

MALICIOUS

PDF

80.3 KB Created: 2021-07-17 20:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a81e289cc37f6a5cd16dbf594efb908 SHA-1: 1354734db4c59a70ced1d613d7753b65f8f61c90 SHA-256: 05b1e9640f960cb09089ba47ebde9234687c16fbd5d5ec6cdca2092f46ec8720
96 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded URLs, though many are marked benign, suggests an attempt to lure the user to external resources. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall heuristics point to a malicious PDF.

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/sq/ugae/~3/k6oGaauGqGM/square?utm_term=collection+of+essays+pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f24fe21db272198f8caf36/1626492898923/nowiza.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edbb2e1fa73e424912a421/1626192686621/dafalanesimoxosewunuf.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee5e06b82b30476862750e/1626234374327/sezunexefasatogef.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f110228ed7c6554e7a78c6/1626411043069/pdf_to_word_converter_for_large_files.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f27b7dcba7b71501de2921/1626504061714/laser_treatment_for_astigmatism.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecc16121140c20d85359fd/1626128737913/recommended_item_level_for_mythic_dungeons.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec81a85f604029b99149be/1626112424919/translate_el_from_spanish.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edca84d6ef6771c1d9acd2/1626196612807/86955610094.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edaa2846a7611a87d0a676/1626188328713/romivijiwazafadupofum.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee1d528e3fff2bd3bdf577/1626217810639/zinebewogib.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_off0000da43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
font_01_sfnt_off0000f255.bin
09fff8d856b3f93ea7c27e707fd843137951b2f1fb1ebb4de2ce7b035fc00dba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16348 bytes
font_02_sfnt_off00011cb8.bin
9414a5d0bd768607709cd056cae5544879590179b5a43fd5bcf201c7881e217f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 10660 bytes