Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f61b50b091d55a…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 05:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fd5a6f2402e9b4b80079b72cf16a64b SHA-1: 93be1f00ca3dc09400d74825b344e605fd3dcef8 SHA-256: 61f61b50b091d55a70404c971c2832b43fc58f17717df0a625e183bbc563cd3a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or payload delivery mechanism. No scripts were extracted, but the PDF structure itself is flagged for potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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/gOBB6uaVNRA/square?utm_term=the+balance+on+the+balanced+scorecard+a+critical+analysis+of+some+of+its+assumptions
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f08091f7c1400a0c482775/1626374289924/rusapos.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0bb00db86a67d857c1b44/1626389248419/3_and_13_card_game.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0ac01d2a41234944bb86f/1626385410183/top_recruitment_process_outsourcing_companies.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee5123e9cbfe6c2fe962a7/1626231075109/32059226995.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e90059e6a58043b6902b1b/1625882713952/31925184349.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0c6a6c9cf4d4000066489/1626392230573/13495238730.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e925068ce0e10532d2d6bd/1625892102509/how_many_odd_numbers_are_there_in_100.pdf
    • https://doi.org/10.22452/AJAP.vol13no1.4
    • 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_off0000f9b0.bin
7042184b8524baa954b947f82edefda3f86b9c1ca4bc2fe5c067e89e4797319b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 18360 bytes
font_01_sfnt_off000128dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128DC 16792 bytes
font_02_sfnt_off000140f3.bin
173c9063c8d36d14d9a32dbf8b27e6914b5391796680c201630dd7f3b4d5e30c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140F3 11200 bytes

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