Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5d66d74900bfb8…

MALICIOUS

PDF

74.5 KB Created: 2021-05-08 18:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a8e41ff7d96cbc34e582ec7ec176812 SHA-1: 78d9e5d9a6304a89d7c0511829168a80516081d4 SHA-256: db5d66d74900bfb8820b46b17af2db142ae4206becdd93531522def34f6bb9af
224 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with several pointing to suspicious or known malicious redirector domains such as 'yafferge.ru' and 'managerprogram.live'. The document body appears to be heavily obfuscated or corrupted, preventing a clear understanding of its lure, but the presence of multiple suspicious links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://yafferge.ru/strik?utm_term=best+turntable+cassette+cd+recorder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_6055cf5b5760b.pdfIn PDF document text
    • http://managerprogram.live/96983207883vleai.pdfIn PDF document text
    • http://sell-toclick.online/wanesipodevubozmia4y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378853/normal_5feebe3c24faf.pdfIn PDF document text
    • http://pusaburuku.22web.org/pisedofinolejavesajemarej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392470/normal_6001525d6c31f.pdfIn PDF document text
    • http://help-mediasupport.com/diridijuwidivexuvokixokuc86u9.pdfIn PDF document text
    • http://fejekadiwoxobiz.getenjoyment.net/liwazotebidexevidaker.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/nafilimavugawutigodosurug.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/riesgo_relativo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_60537e1803003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_5560edb6440f441cbbe2121ae94e9dc3.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_d63904f5c524481eba275a8a79f8367a.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_bd6dea924a98444ba621385a3bf08463.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90c5c65-4dec-4825-be36-be75fb8b241f/how_to_reset_rca_tablet_with_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57c93642-c52a-4d85-b2b2-0942982bea87/26174848762.pdfIn PDF document text
    • http://gejulakan.epizy.com/jeleja.pdfIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_f327289a171c408a9abde01fb1fab0a4.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_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 5120 bytes
SHA-256: 714dce0c3d13734666f133a309e97586bb08064e3e0b0024a1af92d5556fc9b5
font_01_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 10708 bytes
SHA-256: 497e0de8340858d73ecd90b61d9fa9893ea7440850bf3e8505a413d1315d76e1