Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5cc3214a5461e2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-31 15:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 65a1b15ad184b22a92d11a7edbc5731f SHA-1: 738fe441be52dcebf6f9d372cc2b8931cee4ce52 SHA-256: ae5cc3214a5461e21a13d67ffafa2d59683c58d9aa0a70f490260f686007c0a2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gimoguvi.ru/award?keyword=waste+management+pdf+articles PDF link annotation
    • https://devanuwi.weebly.com/uploads/1/3/0/9/130969177/9883391.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/what_does_terminate_mean_on_roblox.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/bacterial_antibiotic_resistance.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/introduction_to_phonetics_and_phonology_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_c1012c74935f48e2a57ea1437ff3149f.pdf?index=trueIn PDF document text
    • http://rogofideb.onlinewebshop.net/fetipiwixine.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_a2e25e4e4ccf42c092b1f5689e27c81d.pdf?index=trueIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/comprehensive_biology_practical_book_for_class_11_free_download.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_4059faf503024d56aa01f01cf65b270c.pdf?index=trueIn PDF document text
    • http://bujekotu.atwebpages.com/nomuluzedakakiravomak.pdfIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_0f7334ae3e39456c9ed8b320b7535564.pdf?index=trueIn PDF document text
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_db7b3ce2f9364efba7ac442d63d751c1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7C 5488 bytes
SHA-256: 8eb1ad0352b8bfa9f7c6c08437fcc0a8467c1309c3f24f48371771e68e15ab7f
font_01_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 11892 bytes
SHA-256: 73db138aaf74895e64325e894520da00d9571c5afcfd5f36ed86f47147b9d428

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