Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86a077a72bbdfd8…

MALICIOUS

PDF

73.8 KB Created: 2021-03-13 23:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5e74ed38dc973434dcd68c5a0fc8dc4 SHA-1: ea80cde44acf458160bd8fadc4eb93818a9db8ca SHA-256: b86a077a72bbdfd8118c0c075e6ac3cf4ce73e52d8388d79f7e26fe212c0c48e
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=gradle+in+android+studio+tutorial
    • http://mesanezedid.mypressonline.com/mcqs_on_aldehydes_and_ketones.pdf
    • https://cdn.sqhk.co/disumuneriva/hdgfv2o/92239398905.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/6a76afa.pdf
    • http://dexaputanit.mygamesonline.org/susasigidozetobuzum.pdf
    • http://kawafopi.mygamesonline.org/faringitis_gonoccica.pdf
    • https://cdn.sqhk.co/fojevimexu/WBhiji0/cat_escaped_outside.pdf
    • http://xomunuxeju.sportsontheweb.net/pikasemefapurepigapax.pdf
    • http://ninuwekevap.scienceontheweb.net/a_traves_de_la_biblia_notas_y_bosquejos.pdf
    • https://pepulumowuso.weebly.com/uploads/1/3/2/6/132681954/vutimurekix.pdf
    • http://kadaxejob.mypressonline.com/introduction_to_mechanics_of_composite_materials.pdf
    • https://cdn.sqhk.co/rudolikube/hajjjda/kopokuna.pdf
    • http://kazimibi.getenjoyment.net/rinnai_tankless_water_heater_rl75i_manual.pdf
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/vomukebuzibipepitixu.pdf
    • http://pixunune.sportsontheweb.net/illinois_reg-1_form_instructions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mozirolinitaje/msa_frp_bypass_apk_2017.pdf
    • https://s3.amazonaws.com/jitimesolagun/10379708228.pdf
    • https://s3.amazonaws.com/rebomedug/best_free_astronomical_app_for_android.pdf
    • https://s3.amazonaws.com/xurixado/appbounty_mod_apk_free.pdf
    • https://uploads.strikinglycdn.com/files/72bc2d07-64e5-4cce-9561-e62d3d8179d7/dorijidijelapol.pdf
    • https://uploads.strikinglycdn.com/files/fbf9c3c1-a555-48a4-9ff8-5c3af7d8a3fd/monsters_vs_aliens_full_movie_in_hindi_watch_online_free.pdf
    • https://uploads.strikinglycdn.com/files/18ce5fea-b9d7-4a93-a80c-94869d9d1162/how_to_write_a_literature_review_dissertation.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_off0000e436.bin
d94eb7f5986c85890256df893d28ca50cf84bba826c5d03877b0f12664165c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 4848 bytes
font_01_sfnt_off0000f4be.bin
60a16bbc74d0bcb88ffd839de1af7a025177806f6ff24d9379b57774900cb0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 10904 bytes

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