Malicious PDF — malware analysis report

Static analysis result for SHA-256 490b881b6da6a9fa…

MALICIOUS

PDF

77.4 KB Created: 2021-07-18 07:39:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a93e692b21ca3273c9656ce67135889 SHA-1: 5cdbbee516b5065569653eae8751aa69f4352cae SHA-256: 490b881b6da6a9fa929ed71adcaa6fcc735b46130e96f635d2746e53ef788476
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of embedded URLs, although many are marked as benign, suggests an attempt to lure users to external resources. The file's structure and classification point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8972

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/ZV5PD9BTPXI/square?utm_term=printable+calligraphy+practice+sheets+pdf+free
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e819bd95719b356d954bad/1625823677117/zoxirufoxelibax.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8f8545711547b6a728be/1626115973311/tom_and_jerry_classic.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e05acc7c0864592377c1/1625874522796/40967482049.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e88a33bd02c20dd77f8e2a/1625852467355/48662393182.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec837cfa40056e74d23fa6/1626112892579/pobulakemafejetadegevizom.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1462a74384d54fdfeeabf/1626424874907/highlands_ranch_leawood.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_off0000cd0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0A 16792 bytes
font_01_sfnt_off0000e521.bin
d29d9018cd818686f28e8e3d3de8f551d7ce9c9c6d7239fa49df56877b957d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 11032 bytes
font_02_sfnt_off0000fe4c.bin
60b4dda945af22f704e9d71236090ced69ee60cc245438faec4571087cd0f806		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 16652 bytes

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