Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c948df4e2244c46…

MALICIOUS

PDF

104.9 KB Created: 2021-04-18 16:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fdd0245e1bf249cfc63edb0ff60ca664 SHA-1: b7aa4ba65c913732c0b34c4a431dcde9953ccf02 SHA-256: 6c948df4e2244c4674a3e038323df1d951288f69b067a5ec033177db7eb1690e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of numerous external links points towards an attempt to manipulate search engine results or distribute malicious content via these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=fenix+2.0+vaporizer+reddit PDF link annotation
    • https://cdn.sqhk.co/fanasuzajem/gUhcegg/vuburokezedilo.pdfIn PDF document text
    • https://rekozoweno.weebly.com/uploads/1/3/4/3/134364890/6910273.pdfIn PDF document text
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/15f251c2a3c13.pdfIn PDF document text
    • https://kibaranelon.weebly.com/uploads/1/3/4/5/134583153/loniwuwerogororuxol.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/tubesudos_zanuxotawiwesi.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/bQjgkhj/path_of_exile_neversink_loot_filter_guide.pdfIn PDF document text
    • http://jabakibiv.iblogger.org/book_of_secrets_president_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/swocuhg/10803404793.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/7fjhHjj/car_driving_simulator_sf.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/icYAwih/repofu.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/vudutegor-medajifugurilul-fotimiwem.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/7139005.pdfIn PDF document text
    • https://nobarolibefo.weebly.com/uploads/1/3/1/4/131407117/retejasos.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvurero/U4iajdx/how_to_pass_chemistry_exam_in_one_night.pdfIn PDF document text
    • https://www.vaposIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lerapavuzuloz.epizy.com/60261172295.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/mamexiwuxojipazanuvonupa.pdfIn PDF document text
    • http://maduzelur.epizy.com/bowditch_rule_and_transit_rule.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/piduxovagopalu.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/joined_reports_dashboard_salesforce.pdfIn PDF document text
    • http://pidawuz.epizy.com/65125726982.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_off00015be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE1 5184 bytes
SHA-256: 42bbe4856fc4ec8dd481dfd8ca3d5354de6a57b67d47511c2b69d21279622bb9
font_01_sfnt_off00016dad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAD 11872 bytes
SHA-256: e41b73af19da45a2bfc68d8d5a6b7ae278e65ea4fe04070d3cd02b9ca6428434