Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c8607fa05d27b2…

MALICIOUS

PDF

74.1 KB Created: 2021-04-24 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05545c3af92aa0cf29466b27ec2f832d SHA-1: 5b473c36fab8d1e51fd7ccf30a394aa3a3d37012 SHA-256: 58c8607fa05d27b2532ca62bbd0c217ba729a6b5e0458dbe7253a72dccd6241d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and exhibiting characteristics of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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=how+to+reset+sony+6+cd+changer In PDF document text
    • http://womirewuzakuf.sportsontheweb.net/broderbund_creator.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/jobabedulezogerauvusz.pdfIn PDF document text
    • https://guxanavos.weebly.com/uploads/1/3/4/2/134235011/tiviwabirori_komibetitizila_rikofoso.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/banking_awareness_for_sbi_po_2020.pdfIn PDF document text
    • https://zikamesezelili.weebly.com/uploads/1/3/4/8/134857079/6586808.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/2849185.pdfIn PDF document text
    • http://tukameduk.22web.org/fonulozekujutiwujazaforuz.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/cantharellus_cibarius.pdfIn PDF document text
    • http://lamovingcompany.com/fractions_to_percentages_worksheet_ks3zvr60.pdfIn PDF document text
    • http://sobakin.space/anniversary_songs_in_teluguspkzq.pdfIn PDF document text
    • http://mavito.online/march_assist_app22mz4.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/applied_ballistics_for_long_range_shooting_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wobanunep.myartsonline.com/marriage_bible_study_for_couples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bc97d4-b5d7-4685-a8d3-bc74586f35d9/87985095697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a29d552-c0e7-4fa1-9715-3593e1d2af62/bmw_e90_aftermarket_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6392bbbc-5505-402c-8fb6-9dc313be74c3/2011_bmw_328i_owners_manual_without_idrive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07ad6251-989e-4c3d-89ea-03ad60ead6b0/76868906792.pdfIn PDF document text
    • http://toxukagaxopud.epizy.com/2003_chevrolet_tracker_manual_4wd_suv.pdfIn PDF document text
    • http://wodedane.rf.gd/36397911415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51992087-9b44-4740-8739-224985d84c7e/62553848629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa3468f-9747-46dc-92c0-cfe588254bb8/57225728216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39660e72-e2a7-4948-ba8f-9d2ffdede320/pezebojolu.pdfIn PDF document text
    • http://gomiloja.epizy.com/how_to_fix_cabrio_washer_lid_lock.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_off0000e116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE116 5480 bytes
SHA-256: c59ec50bb14e9c36a3e6ea806beff47c53e7f516688b6ad0551b03f6b6cef0cc
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 11012 bytes
SHA-256: fc73a2a8edea2d793ab1968e304aacb367d0645867c6ca94f6127d1fe7bf662b