Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ca8a0c7600d951…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 20:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 716adf96d53c8e66fb028183ff26eed6 SHA-1: 0529ac1a476e7b21cd4a3ce719bbe7fa42ed4ad1 SHA-256: d3ca8a0c7600d951e5a0832528dbaed8c9142641b3b70466de8c811900a74ea7
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, although some are marked as benign, suggests an attempt to redirect the user to potentially harmful content. The PDF structure itself contains duplicate objects, which can be a technique used to evade detection or obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5959

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/gPkW7oTCsL0/square?utm_term=active+and+passive+transport+worksheet+answers
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e85e54344da47feb0c5619/1625841236678/gamorad.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e90e0266be7e490f0ed184/1625886210930/89536953054.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eca368651b7076defdb6bf/1626121064321/nursing_past_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60efec72874a183f1c3fc344/1626336370849/go_wild_for_a_while.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_off000100a2.bin
227f27087c40aac577f2d8255bb61bba377f9910ff645a842bce23426c522fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 17092 bytes
font_01_sfnt_off00012d3b.bin
ad4e0f05afc80e88874cafa833715237b83c94fcbdc539e5377c8e69b243c126		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 10792 bytes
font_02_sfnt_off0001462f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 16792 bytes

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