Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3a523a3a0767fb…

MALICIOUS

PDF

72.5 KB Created: 2020-11-10 17:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 527039433160ae44e71074b9ecac13af SHA-1: 1b8374ba89acd9c5d5a08ca6c30dbefa1f194e4f SHA-256: df3a523a3a0767fbd8bcf23fdcab89f57ec0943ea636c23b4396d167fd8a7b0a
284 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to disposable hosting services, designed to create a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'traffking.ru', which is likely intended to lead the user to a phishing or malware distribution site. The presence of 'cmd prompt' in a URL suggests a potential attempt to exploit or trick users into running commands. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://traffking.ru/strik?keyword=open+ports+cmd+prompt In PDF document text
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/xixobura.pdfIn PDF document text
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/5d4dd6.pdfIn PDF document text
    • https://kawuloxegulul.weebly.com/uploads/1/3/4/3/134389306/9531b5d7204730c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467912/normal_5fa49d8baa81b.pdfIn PDF document text
    • https://lofelafor.weebly.com/uploads/1/3/4/6/134665038/gipemaxuturixix.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/lasupuwawuketi_kanovo_panarexodanin.pdfIn PDF document text
    • https://dumiwexadanona.weebly.com/uploads/1/3/4/5/134522913/3644597.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f90a0d67ba93.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/2ce90156-5f3f-4733-a0da-ca34fd919451/pufufiluguganipukapem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7eae9d-1d8b-4fad-926a-f46263c3b100/bad_piggies_unblocked_hacked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a33927-a43d-49af-9d8e-11ab6f7856b6/candydoll_sharlotta_s_21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f90bd2-a0b7-4051-84d1-a6f51031c856/52933017946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94946688-f1ba-4756-a06f-8392d6b280d3/vemafuxifijezikujub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3ffd438-ad7a-4935-9427-d1056869ceaf/search_for_clues_to_the_keepers_whereabouts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91c61405-30f1-4c5a-ad00-3e5b5a86ffd8/67019860299.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_off0000ddc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC5 5004 bytes
SHA-256: 942bf879bc2d56ce58ab31a949f9b83d81a10c7d13948b117ee2be2c2e44ec27
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 11320 bytes
SHA-256: 5bba68584d5502ec179d53845e6e10dd6716003a24bfb022a59bc95cfd026e69