Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5ff95a09ae8c26…

MALICIOUS

PDF

82.9 KB Created: 2021-06-13 20:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f1db8b89e7256d5d23f91b249de4a9 SHA-1: 0a711f10f6e3d4140619f401915fb66d85b6ef49 SHA-256: ec5ff95a09ae8c26761a2ff16350f3155b95cbbc5d4ba764b54005c97c02a951
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link and a link farm of other PDFs, indicating a phishing or scam attempt. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=best+android+tablet+for+reading+pdfs', are designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to distribute malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=best+android+tablet+for+reading+pdfs
    • https://wilowukodol.weebly.com/uploads/1/3/4/8/134881933/rupilifeva.pdf
    • https://fezinonod.weebly.com/uploads/1/3/1/0/131070080/a01ba3.pdf
    • https://cdn-cms.f-static.net/uploads/4366965/normal_604153bcbee05.pdf
    • https://gijenufojuli.weebly.com/uploads/1/3/5/3/135335104/defededolum.pdf
    • https://cdn-cms.f-static.net/uploads/4464053/normal_601b7fa85f6aa.pdf
    • https://zataxusesuta.weebly.com/uploads/1/3/4/3/134311667/xilexa-zazagegi-luferebew-kojadekasez.pdf
    • https://cdn-cms.f-static.net/uploads/4465703/normal_604499c1dbb82.pdf
    • https://cdn-cms.f-static.net/uploads/4410703/normal_604f8599d78d6.pdf
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/jobewejamegurig.pdf
    • https://vutibije.weebly.com/uploads/1/3/4/6/134672754/0e3a5199741f.pdf
    • https://static.s123-cdn-static-d.com/uploads/4449777/normal_60b0c009efc55.pdf
    • https://cdn-cms.f-static.net/uploads/4369796/normal_602a3a0de47eb.pdf
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/9114957.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sejuworepow.pbworks.com/f/coc_unlimited_everything_hack_download.pdf
    • http://nigezid.pbworks.com/f/whats_a_rosary_when_someone_dies.pdf
    • https://uploads.strikinglycdn.com/files/7e631763-0e33-472b-ac41-c215c8aec945/12691921406.pdf
    • http://xovakovawup.pbworks.com/f/how_to_fill_roadies_form.pdf
    • https://uploads.strikinglycdn.com/files/8c0961f3-1155-471d-ab55-d3b85349156e/what_is_the_remote_code_for_sony_dvd_player.pdf
    • http://kunixove.pbworks.com/f/first_break_all_the_rules_free_ebook.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_off000104d2.bin
ef578bffd8668f784eabb34fb1daf236998c724b5bd04774ae6cb41dc286553e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 5396 bytes
font_01_sfnt_off00011739.bin
47ff3824721c8d681a8bf729062a414b9db33b7385e682e9ff206da80c6864d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 11428 bytes

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