Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898253fbdf8489d…

MALICIOUS

PDF

87.1 KB Created: 2021-04-24 17:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99ff3f3c1d44b6d7cca40b83a03fc1c4 SHA-1: dbc0dbaffca7d51d0ebab49cbb379356c011ffc6 SHA-256: 8898253fbdf8489d1e6dfd8679c03e0e28cf2b3a34971e5af12cd0eaeb32e0a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a heuristic indicating an embedded external URI. The document body, though heavily obfuscated, contains a title suggesting a lure for financial gain. The presence of multiple unknown reputation URLs further supports a phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.ofalloncasting.com/sites/default/files/webform/nunemoxajusadokuxilebe.pdf
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/zarogoluvesiriwameb.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/40307308503.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/niroxopewesanusogub.pdf
    • https://ambrose.edu/sites/default/files/webform/padubomi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/55178968397.pdf
    • https://www.a1touchsolution.nl/sites/default/files/43963154407.pdf
    • https://www.blplegal.com/sites/default/files/webform/89971565628.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/43403042061.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+filthy+rich+in+rising+asia+sparknotes
    • https://www.healthdata.org/sites/default/files/resumes/78922999772.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/99818817157.pdf
    • https://drones.princeton.edu/system/files/webform/zifogisabivaloxigisosobu.pdf
    • https://www.vub.be/sites/vub/files/webform/43319512550.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e308.bin
1c804b826704477ea10d5f6244a5ee38cee51b56334ccdd958ad5099b013ec12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5284 bytes
font_01_sfnt_off0000f509.bin
d2768027c12f75da905503f594787dde5d5969dbfc8b0d3e2859cac239c451d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5020 bytes
font_02_sfnt_off000106f8.bin
6f204864dd48535f883101eef78e7eda5a3c579b6e7054afbbf97fa985b7a3ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 10344 bytes
font_03_sfnt_off00012ab3.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 16344 bytes
font_04_sfnt_off0001402c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1402C 4324 bytes

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