Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146fd43155c949c…

MALICIOUS

PDF

83.5 KB Created: 2021-07-18 13:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 122e83c8f9a3df17d33528ac33bc3b68 SHA-1: fdc115d04228d9eb2dbe9b2eacc4f8470fc362ee SHA-256: 4146fd43155c949c538603245875204303bc19cb705de8baaefdbb35c379a49e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure and embedded artifacts do not reveal specific scripting languages, but the overall detection points towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/jEScUJLm1bs/square?utm_term=funny+wfh+quotes
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0abdfa73a60253d81c4ba/1626385375678/smiths_food_king_weekly_ad.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e92801787dde1a90ae36af/1625892865867/methods_section_example_research_paper.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60efee05a9bc231ac1ce4761/1626336774029/resistors_in_series_and_parallel_circuits_lab_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec84d6ff9c8b53cea2958f/1626113238544/xokikomexurevozusefesirat.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edfec4a50f6e33a327d950/1626209988301/18715098004.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f040787fedc2490c0dfc5a/1626357880486/how_to_combine_4_files_into_one.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee653284a0477e84adc984/1626236211033/ce_laws_contracts_specifications_and_ethics.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f398ca8a396f1703a259bc/1626577098590/nifty_250_small_cap.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7dabc687a3d659a4c17ff/1625807548811/dark_souls_2_crown_of_the_old_iron_king.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7b7434454ab0ddd842f51/1625798468161/telorevapixofemavipezuse.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e928a48915684aa53d8ceb/1625893029020/13756792652.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_off0000e7d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 16792 bytes
font_01_sfnt_off0000ffe8.bin
7233cd3895c547c6fe22ab104145bb411e2733ee5d69fa9c67f6ca78bc29114d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE8 16756 bytes
font_02_sfnt_off00012b93.bin
fa23a2fa266955f44368f935af3a8262dcb768d422c6217d24ff2cae1c45a031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 10336 bytes

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