Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8582ce8a6772925…

MALICIOUS

PDF

78.1 KB Created: 2021-07-14 06:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 956f0d122f4864b947c15ad65fc79d1a SHA-1: 27ae7e5a9c5c982a012c2545da875fbab0404fe9 SHA-256: f8582ce8a6772925b75705841b219edf1e5be6d4452f999391008bd511371f04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a URL that, while currently benign, is likely part of a phishing or credential harvesting scheme. The document's content, though heavily obfuscated, suggests an attempt to deceive the user into clicking the link, potentially leading to further malicious activity. No scripts were extracted, but the presence of embedded URLs and the ML detection strongly indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

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/gOBB6uaVNRA/square?utm_term=theorems+of+probability+in+statistics+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e949943ba7d954d54759dc/1625901460278/vexadeferubivaf.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec82ce3a853d606aec7bb3/1626112718949/39084359398.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee154f3753dc428c855900/1626215759706/what_is_the_most_reactive_family_on_the_periodic_table.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8005480504e0a776b05ae/1625817172577/homosexuality_in_humans.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8ee62b132fa362070d9b8/1625878114935/segurodorejijanopabe.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee08281cf0e6777f2a4d29/1626212392796/house_sale_and_purchase_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_off0000cf9d.bin
56f7168c83327251af08df337f8f11f7d5de7f920631037e718b7815627673cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16592 bytes
font_01_sfnt_off0000fac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 16792 bytes
font_02_sfnt_off000112df.bin
3c80b3bbde0ac46c0c3df9caa4935ce960657de3f7e51b78cc76c6eb2ddffa1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 11104 bytes

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