Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbdd0271459d383…

MALICIOUS

PDF

74.7 KB Created: 2021-04-24 18:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0c6572eba1b89fb2fec3327e8ab20e5 SHA-1: b56dbb0ad2c51a337daa2d375a1683d0df68ce06 SHA-256: 9bbdd0271459d38305834277e26388167299c36e120b510fb113951cceac0ea5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to potentially harmful websites, such as the one found at 'https://nipisod.ru/strik?utm_term=mind+over+matter+lyrics+young+the+giant'. The document body, though heavily obfuscated, appears to be a lure related to lyrics, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=mind+over+matter+lyrics+young+the+giant
    • http://wacc-cat.org/rosugifefulutajazedinv3n1c.pdf
    • https://cdn.sqhk.co/vobevufubito/gjgieha/78652102402.pdf
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/67f9364fa905.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • http://fastpeysistem.online/wifelaxilagalopagixiruzu69nwc.pdf
    • http://trells.space/46611189953pjccd.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/8505555.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lawakux/77501138707.pdf
    • https://uploads.strikinglycdn.com/files/a6b72d67-bdfa-4c44-8193-9e00b4f8f9fe/how_to_line_of_best_fit_desmos.pdf
    • http://lavowatovodab.rf.gd/calculus_3_notes.pdf
    • https://uploads.strikinglycdn.com/files/7a3960de-4dac-4e33-b5c4-0a1dcfe39f0f/python_check_if_string_is_capital_letter.pdf
    • https://uploads.strikinglycdn.com/files/5da1e459-7273-4736-82f4-853ec1df8fb1/what_does_incapacitation.pdf
    • https://s3.amazonaws.com/jivala/send_anonymous_sms_app_android.pdf
    • http://tinazas.epizy.com/nixipubuwafebumuronota.pdf
    • https://uploads.strikinglycdn.com/files/40dbb12b-4087-4658-966f-91b7e18183a0/auto_air_conditioner_repair_cost_guide.pdf
    • https://s3.amazonaws.com/jugobimuraje/89523584602.pdf
    • https://s3.amazonaws.com/kigavanus/selox.pdf
    • https://s3.amazonaws.com/geraromu/what_is_an_ecological_tipping_point_in_hindi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e779.bin
b85732b9232de76193ebd598541a0e8505a7b95256bd777fb5a8e04a9e626a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 5520 bytes
font_01_sfnt_off0000fa27.bin
90c69a04326e3eb175161537cda3db41965a45a7fdf5b016aeb5efe612361259		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10336 bytes

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