Malicious PDF — malware analysis report

Static analysis result for SHA-256 421cffef9d04fb8b…

MALICIOUS

PDF

84.3 KB Created: 2021-07-19 10:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0130fe1215aca3ffdc2e824062f40ca6 SHA-1: a37dca438531889d3773d7c776ff53bad1b50741 SHA-256: 421cffef9d04fb8b2523b91529471b6d958c8b2b155c6816bd670b6e46e611c5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains embedded URLs that, while currently classified as benign, are indicative of a phishing or malware distribution attempt. The PDF structure and embedded content suggest it's intended to lure users into clicking malicious links or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6359

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/CHqDoFjlE84/square?utm_term=how+to+pdf+edit+free+software+download
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edd2923be50f2c5dac5ca2/1626198675214/what_do_tree_lizards_eat.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82cca4b964f05b84b4ecd/1625828554181/comprehension_passages_for_grade_2_with_questions.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e94e01cc7c08645928281d/1625902593846/body_by_design_fitness.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_off0000ea77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
font_01_sfnt_off0001028e.bin
5be05126dbdbe1ad090cdb453f8f5db8e1ce7794ea014ea65c7d023863d4e59d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10568 bytes
font_02_sfnt_off00011ac9.bin
decf66d877d798734037ca11275ea38c4fdaf830d53e8f442bae237a87397fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16464 bytes

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