Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed13a1e4d3dc85bc…

MALICIOUS

PDF

72.9 KB Created: 2021-01-22 05:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e15410a7eec115704a67714da9be2444 SHA-1: d4401fc66b304573a0f1f2a41f215bc3adf11df6 SHA-256: ed13a1e4d3dc85bc275cf604ce824e2eac03f6f0b2387bc3bee62962766da4d1
184 Risk Score

Malware Insights

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

This PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this file as malicious. The primary IOC is the redirector URL, which is likely used to host phishing content or distribute further malware. No scripts were extracted, but the presence of malicious links suggests an attempt to lure the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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 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.
  • 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://ggtraff.ru/aws?utm_term=network+monitoring+tools+for+windows
    • https://site-1177315.mozfiles.com/files/1177315/14948101444.pdf
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5fe7a133ccbdf.pdf
    • https://site-1168018.mozfiles.com/files/1168018/where_to_buy_finger_basketball_game_online.pdf
    • https://site-1173894.mozfiles.com/files/1173894/hsbc_bounce_back_loan_scheme_problems.pdf
    • https://site-1171615.mozfiles.com/files/1171615/40312078633.pdf
    • https://site-1225452.mozfiles.com/files/1225452/numazexi.pdf
    • https://site-1174866.mozfiles.com/files/1174866/bestie_camera_apkpure.pdf
    • https://cdn.sqhk.co/guposidum/ihvjhib/porebenut.pdf
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fdc246e2f592.pdf
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/5278525.pdf
    • https://site-1246086.mozfiles.com/files/1246086/obusforme_highback_backrest.pdf
    • https://cdn.sqhk.co/jokufemij/eHhdibp/the_farmstead_napa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vedumojaje.epizy.com/coffee_meets_bagel_latest_apk.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_off0000e0c7.bin
659436f20ab02dfbc731dc535076a491c67e1b9f74e0cbf042a2df1c03070c2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 5140 bytes
font_01_sfnt_off0000f24e.bin
91ad9ab6333d4e7b87e72673ada78f0f9bb377d8d77e1acca9e2bc890fb29874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 10752 bytes

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