Malicious PDF — malware analysis report

Static analysis result for SHA-256 51fdc9b8129e9a12…

MALICIOUS

PDF

67.5 KB Created: 2021-03-08 03:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: aec04a2cdbed672258ef3dce2317c4ea SHA-1: 410490d25e2fd436e5792cd724f3fb89cbb32e83 SHA-256: 51fdc9b8129e9a124705dee02b70bf9f2ac7e5e0c48e2bb92548378d17b61ba6
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with critical heuristics indicating that at least one link points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=international+journal+of+research+in+medical+sciences+and+technology In PDF document text
    • https://cdn.sqhk.co/nemizuxe/jcJij8X/pefekagamogugafemijat.pdfIn PDF document text
    • http://yourdesk.website/appelle_moi_par_ton_nom_ekladata44wyn.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/carrie_fisher_wishful_drinking_netflix.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/doroxigamarawujadetikevob.pdfIn PDF document text
    • http://gatorama.space/46480818954u6hr.pdfIn PDF document text
    • http://golomashvanna.xyz/krups_beer_keg_machineug1u9.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/gfibibN/47325450238.pdfIn PDF document text
    • https://cdn.sqhk.co/lajawawinu/QDgfha1/microsoft_teams_download_mac_os_x.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/60845695002vds3u.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/f3d12ac0-bf7c-4a17-af04-0ab1e2c3f65f/animal_farm_by_george_orwell_literary_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15bfba2e-cd0d-4ebe-8b23-b99e5a8f61fc/gps_tomtom_go_6000_prix.pdfIn PDF document text
    • http://dizogabage.rf.gd/58040311354.pdfIn PDF document text
    • http://fazozogujezeto.rf.gd/bootstrap_form_center_button.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e21a1a-a435-41a6-9137-8db79b028169/43854868034.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 5552 bytes
SHA-256: b87be22be0409cd3af338f7da362a92f93d9bd519442983c5d5c545cc52233ea
font_01_sfnt_off0000ddcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCD 10180 bytes
SHA-256: 36c55d1add48570b37e6ee067331bd3c4dee3d81e1d62546bb46ee13e5db1a99

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