Malicious PDF — malware analysis report

Static analysis result for SHA-256 6363a2b1e40afa07…

MALICIOUS

PDF

92.2 KB Created: 2021-03-23 18:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1cbc7c5d5f081b3eb75cf5a1eb488b02 SHA-1: 7b0693bbc53c2c6429015be318e7073899f1e77a SHA-256: 6363a2b1e40afa071787d15dafd773aaaae2cb62da669d5f12d42c716836d7b3
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting and suspicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/strik?utm_term=jandy+pool+heater+troubleshooting+fl4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391013/normal_60356910e010a.pdfIn PDF document text
    • http://mebets.xyz/what_is_the_4th_industrial_revolutionq86lo.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/15d38ed7e59.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/b416d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388833/normal_5ff1340283e4d.pdfIn PDF document text
    • http://ketousa.site/pablo_neruda_poetdsd2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422884/normal_604840220c4ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378151/normal_600265280d9a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fe7ca4699803.pdfIn PDF document text
    • http://com-login8.xyz/password_keeper_printable_sheet5hkuy.pdfIn PDF document text
    • https://pamuguvijokogag.weebly.com/uploads/1/3/4/8/134883264/1561435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_602fc19b8e83b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456676/normal_600022ba4a9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475016/normal_6038bd2248294.pdfIn PDF document text
    • https://potutipuvo.weebly.com/uploads/1/3/4/6/134680823/9075916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6037d30a309a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rivagajogitow.epizy.com/buku_agama_hindu.pdfIn PDF document text
    • http://lesolasate.epizy.com/9861146193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6995e65-12a9-470f-8a22-776cea454a39/jijowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ab0347-1303-471e-91e8-6675749fdc2e/apple_airport_time_capsule_1tb_specs.pdfIn PDF document text
    • http://poxotoromerolu.rf.gd/how_to_stop_heat_detector_beeping.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_off0001296d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296D 5624 bytes
SHA-256: 99d5241852154ca3c7a9b1c82a4d90c34407835fc7875928881f031c7a7c96ad
font_01_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 11516 bytes
SHA-256: 408e4d4ede0af2eb5387f23ec6cfc59ccfe7bf349a0a0a4e3c8cac9a959add44