Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54b23fc24bb94f3…

MALICIOUS

PDF

107.6 KB Created: 2021-07-18 00:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09542d1bc6e39781d396b22f30870e95 SHA-1: eb30f2d78d23de7dec9adec5da0e098261b73075 SHA-256: a54b23fc24bb94f3f2a27700ade336614046468e781b3671d3338ab59c711ffb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those initially flagged as benign, suggests an attempt to redirect the user to potentially harmful content. The PDF structure itself contains suspicious elements, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7979

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://feedproxy.google.com/~r/sq/ugae/~3/XMoLd4EPXkg/square?utm_term=history+of+worship+in+the+old+testament+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f147462c92ee1ddddf1e5f/1626425158227/postpartum_swelling_in_one_foot.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8e799e51f1f218d67226f/1625876377346/sore_muscles_in_chest_and_back.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee83a33753dc428c8c075c/1626244003932/tamil_serials_to_watch_online.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f248a00b17490892034f91/1626491040465/importance_of_staff_training_in_healthcare.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8c2a5d8d5997ba4e5b34c/1625866917463/kevizibifo.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c4ac4be6b65fb4b10468/1625867436191/52346953840.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7da4546a8e17713e4a82a/1625807430009/mujiromu.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_off00014396.bin
201dae3b2b9aa8eff6058d61b25e385f673955e7c662d537409e0d094426b5c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14396 10952 bytes
font_01_sfnt_off00015cd5.bin
cbd4d69d08791c55e1b03c365e0057d64f36bb25ea74024426b3f09828e68c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD5 16908 bytes
font_02_sfnt_off00018898.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18898 16792 bytes

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