Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cfb4168d03fe81…

MALICIOUS

PDF

89.2 KB Created: 2021-01-19 23:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bf967629cfc9a556b691122c8e34e8e0 SHA-1: e57fd8686ff5cc1521ead43ff451c3177142e84e SHA-256: e8cfb4168d03fe8193f4ca58a95992c770f524cba7adaea375dae08c3a4910bb
204 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirector infrastructure and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the presence of numerous redirector URLs suggests an intent to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://traffmen.ru/123?utm_term=my+uiuc+self+service In PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/7addc.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/2ba8b.pdfIn PDF document text
    • https://rodelifefi.weebly.com/uploads/1/3/0/7/130776661/monusowegexaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_5fcafb928fe19.pdfIn PDF document text
    • https://cdn.sqhk.co/sulojumi/fjegjqa/sparkling_mineral_water_vs_regular_water.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd60c9373741.pdfIn PDF document text
    • https://tugixafebav.weebly.com/uploads/1/3/2/6/132681891/8bca6245.pdfIn PDF document text
    • https://cdn.sqhk.co/kopizikob/SScBn3p/download_nes_emulator_free.pdfIn PDF document text
    • http://feziweninepiv.iblogger.org/73745564306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482858/normal_600583329d835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_5fbf651b27733.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475216/normal_5fe13637e11c5.pdfIn PDF document text
    • http://golesaluwo.66ghz.com/bengali_album_song_video_hd.pdfIn PDF document text
    • http://pidivumik.22web.org/are_epileptiform_discharges_seizures.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/4963062.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/hlyjLjh/vavemipesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5fcdb0479a300.pdfIn PDF document text
    • http://feboxazatoran.22web.org/evermore_alyson_noel_romana.pdfIn PDF document text
    • https://cdn.sqhk.co/dufukeraj/jbjbvDW/mixuravepe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bejiteviv.epizy.com/kjv_bible_dictionary_and_concordance.pdfIn PDF document text
    • http://wubonaxe.epizy.com/dafiviluxanuzilu.pdfIn PDF document text
    • http://varepekolati.rf.gd/batman_full_hd_wallpaper_free.pdfIn PDF document text
    • http://solazagu.epizy.com/11530453216.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 4416 bytes
SHA-256: e17ac3168ed590b6d5a5cac857c55cff65c288b040441e62a8e36bb436a0ba9f
font_01_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 10860 bytes
SHA-256: 086268355072206ebe2ff518813c9c5db6f8aebec5a27ffe5ded97757b85e1ac
font_02_sfnt_off00014918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14918 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3