Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1639cf516d5cf…

MALICIOUS

PDF

89.8 KB Created: 2021-04-01 18:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: adf9af8a7b71b38d800d9226aef0a650 SHA-1: 7fc9effd571eeb49f231d3fa26e790db546008e4 SHA-256: cbd1639cf516d5cfa71a922c58b21475e55e6e1077da11a5005d41bbb2176182
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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://vilenefex.ru/award?keyword=acuerdo+de+paris+cambio+climatico+pdf
    • https://lasasokuvob.weebly.com/uploads/1/3/1/6/131607269/werizu.pdf
    • https://lanasasaf.weebly.com/uploads/1/3/0/8/130815311/2324593.pdf
    • http://modernstyle.pro/milupujosudorenoruwilwbgn.pdf
    • https://vakikuxikedeti.weebly.com/uploads/1/3/5/3/135320305/xisosaladikofow.pdf
    • http://beamorem.com/lidejanebuzbr2b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_d7ab96a271d840c493bc1787e9063267.pdf?index=true
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_cc44dc2c8e594657a96871516aafeac7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e8282e9-cfc4-48a7-a2ea-bf27576b3cd9/92238988705.pdf
    • https://uploads.strikinglycdn.com/files/17c10e5a-a791-4f15-9c84-ee40a9554b3b/what_is_available_on_netflix_usa.pdf
    • https://s3.amazonaws.com/xutomoxu/47688348439.pdf
    • https://uploads.strikinglycdn.com/files/4c6f6c74-00ba-4d43-bd32-0e20a8da7e31/72894218584.pdf
    • https://s3.amazonaws.com/rirusozo/database_management_systems_notes.pdf
    • https://uploads.strikinglycdn.com/files/68dc9beb-f782-4a96-b80c-ab8fe4610000/mujef.pdf
    • https://uploads.strikinglycdn.com/files/75e8f912-9611-4b74-89aa-59675df380be/xedifakiwi.pdf
    • https://uploads.strikinglycdn.com/files/4f7ce8b9-8287-4048-89a7-f31c38b6e0fb/60176449542.pdf
    • https://uploads.strikinglycdn.com/files/1c63684f-2448-4cf3-8d7f-0269b7cee6a3/36507583556.pdf
    • https://uploads.strikinglycdn.com/files/b43790a9-4cd6-4939-b640-8a271886acd9/international_mail_cost_calculator.pdf
    • https://s3.amazonaws.com/folexapurilowe/yekkada_yekkada_song_sad.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_17d0041ac9944d3b9fc98563af3482c1.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_off00011bb2.bin
06d7f4eb9a326d3ff4660a75f41f2f55085d72b8160d72e921e442f526335c0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB2 5432 bytes
font_01_sfnt_off00012e0c.bin
bc1d009e17767b3a2cd7d9c03a93783a38bcb6406cba4fa55e7c0e9334831efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0C 13244 bytes

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