Malicious PDF — malware analysis report

Static analysis result for SHA-256 8040d4a3a42739af…

MALICIOUS

PDF

89.2 KB Created: 2021-03-22 20:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8649d85f69d182bbaa7b4048e5548d1 SHA-1: b1d8b8f04970a7d3dcc8f9c060cb81ea8a62deec SHA-256: 8040d4a3a42739afa65cf89e6b94130bf7579423f2dc2ed4d6058b043b6b01a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, identified as a 'link farm', with several pointing to suspicious domains. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=tecnicas+de+evaluacion+de+dinamicas+de+grupo
    • https://cdn.sqhk.co/xekobigi/jfOnjdg/56848401813.pdf
    • https://cdn.sqhk.co/kilatelazobe/idjeify/70392980424.pdf
    • https://cdn.sqhk.co/xumesapaxoku/hjl5ivU/65771373939.pdf
    • https://cdn.sqhk.co/runudori/cFCqhfh/dr_mario_world_how_to_unlock_all_characters.pdf
    • https://cdn.sqhk.co/vedukosamo/e5iaibc/dish_anywhere_app_for_android_tv.pdf
    • http://devlp.design/zujixujvrdzg.pdf
    • https://cdn.sqhk.co/nazamesuwute/gWha3J2/snaptube_mod_apk.pdf
    • http://mgacessoria.online/848111469939g9m6.pdf
    • http://oneitshop.info/purposes_of_writing_a_letter_to_the_editoreln0h.pdf
    • http://bitcoinchat.fun/39400721238voau9.pdf
    • http://marketeuro.pro/lutabumepekonaditdm81n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/61cd78c2-fc02-406c-98f5-e34a160103c9/25089352374.pdf
    • https://uploads.strikinglycdn.com/files/0202e718-3792-473c-a544-5e624f082689/xozopatipep.pdf
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_510781f21feb46fd82a8073571d5c75e.pdf?index=true
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_04b1769bcf714b2babfd1b5e17b75f9b.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_001d6ecac93b48a39099db13e1333f94.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d1edcfdd-6a89-4100-8116-f0e0e229099f/tupopupedomin.pdf
    • https://uploads.strikinglycdn.com/files/cc5a96a8-6123-4db2-8bc4-969d12077141/i_pilot_remote_pairing.pdf
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_3906d88485934bf9bb4eaa193e237d03.pdf?index=true
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_f3082adf052347c4bcae0cbbbd129393.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9a81ef08-91e4-469d-8e2a-dcacdae7e28b/computer_architecture_and_organization_course_outline.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_0f6ea4ea36374c1e9c106fc03679fa7c.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_b59f314b366c4967b82b0eec596b32a4.pdf?index=true
    • 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_off00011dc6.bin
f432efd74af189d64a8a1455bbc10aa08f797665f71b6a78b2c6bc3fe38ba3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC6 5404 bytes
font_01_sfnt_off00013014.bin
29a63bc3ac6a0240d3b03fd318b05030eb8b3cbe248d1a2dc80f28059601a8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13014 12204 bytes

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