Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b8cbec02d9cce8…

MALICIOUS

PDF

70.5 KB Created: 2021-01-06 14:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d870951cf8c5618f8e9c56b0d01f6480 SHA-1: e951937d4d4c02bb924ecc54f020660a4a84e54c SHA-256: e4b8cbec02d9cce8b1654c8f8effad795921d84c402c9fab638d0a7e89be4f36
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to various disposable hosting sites, with one critical link identified as a known malicious redirector. The document also contains a lure to execute commands via the clipboard, suggesting an attempt to trick the user into running malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://gettraff.ru/123?utm_term=sherwood+rx-4109+specs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5fd877728d8b0.pdfIn PDF document text
    • https://danabemove.weebly.com/uploads/1/3/0/7/130776083/luviluzidupo_pajatejitefu_nudikiwas.pdfIn PDF document text
    • https://bikezurikol.weebly.com/uploads/1/3/4/6/134612173/punedigimar_xedud_bazobajadubadaf.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/gawagin.pdfIn PDF document text
    • https://ruwadegefanum.weebly.com/uploads/1/3/4/1/134108857/boxofuvuwag.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/856838.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxevabuvix/Nhhhig6/17049315244.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/ypggie8/city_university_of_hong_kong_admission_requirement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f49ab61-d60e-4614-a781-d28774979225/77940429510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/542fa7de-c4d5-4a0f-9c2c-498d1ae4a2ea/karigiboladoxabafugoso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9acef14e-6676-4b1d-b43c-4e439b79f175/deduwike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add2f8a7-e366-48dc-93c3-459012f5a181/lunudosisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd608849-2c4b-4865-b254-c8cd9eada62c/showdown_in_a_paris_theater_answer_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23d847a5-7b64-4b9e-b6ae-5fa41aa9b918/9382275533.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 5652 bytes
SHA-256: a39e0a1e7cce113627715ed9fb385dcea3d7572b6ce71516e3e6fe1762efc1a0
font_01_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 10912 bytes
SHA-256: 3609824ef400547285ccae9373b19e248723a47534434f7af246a15843037cf3

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