Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30987716d4df4ea…

MALICIOUS

PDF

150.1 KB Created: 2021-07-15 23:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 064e6a886d6870ca72608c8d06452b50 SHA-1: 471379a0e001e6f3694679823bbc7a70a12e3049 SHA-256: b30987716d4df4eac522078ba115d477e7c6cf2280c2902395265140070774f3
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The presence of embedded URLs, even if some are confirmed benign, suggests an attempt to redirect the user to a malicious site or download a payload. The authoring application 'wkhtmltopdf' is not inherently malicious, but the overall detection suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7718

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/y83TWYo-3DA/square?utm_term=blurry+nights+quotes
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee1136f6c772366d2a8aa0/1626214710861/how_to_hide_messages_on_messenger_app.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec840c67baa26076bbce29/1626113037091/20938062413.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e90059b10b9b33fa9684d8/1625882714207/golden_retriever_and_german_shepherd_mix_for_sale.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec8fdcb3b63f0898f2de5b/1626116060840/vufolozebesazamasufaku.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7815e158187605e5936ac/1625784670171/ipad_launcher_for_android_tablet_free_download.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9632c5e0b1320e33c7c2/1626183219070/how_to_see_who_has_viewed_your_instagram_account.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e91e6b18245d33f181a64d/1625890411332/jukivutinakesax.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee868e8e3fff2bd3c452fd/1626244750937/85850551006.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed39cdf84adf285bf06d5b/1626159565268/42588612262.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d8ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8AC 16792 bytes
font_01_sfnt_off0001f0bd.bin
ee35a8306ae847c88735138a52152f4a8841170b727af881e90efa512d60b16e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0BD 16292 bytes
font_02_sfnt_off000206ae.bin
93400d21472bf6057214444efbad9f56cc02956507672fb034d44d4883a50bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x206AE 17216 bytes
font_03_sfnt_off00023350.bin
7099819d53f2b11ccc966ee842c42a97d93683341739e973df456196220f3c3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23350 10640 bytes

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