Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4bcfbd549e06ad…

MALICIOUS

PDF

77.6 KB Created: 2021-04-07 06:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7d7eedb67896c0bc8c634523d503911 SHA-1: 7051ec75c9ba1afe8ecf6188b1cc49ed7c112db5 SHA-256: ff4bcfbd549e06ad79727256b283ff2d6b59ac92dc09237e46382077336dee33
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to direct users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=beach+buggy+racing+premium+mod+apk
    • https://cdn.sqhk.co/terisuzuji/iQRfjcW/83746365515.pdf
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/40bfd58697969ad.pdf
    • https://revanesowokaw.weebly.com/uploads/1/3/4/6/134652238/7371ff8d177.pdf
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/suzorotanudedutidoja.pdf
    • http://jewofuvivonog.getenjoyment.net/6_practice_tests_cambridge_fce.pdf
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/runixafu.pdf
    • https://cdn.sqhk.co/fujalapevame/iihaSRs/best_time_management_books_2019.pdf
    • https://nokejulaju.weebly.com/uploads/1/3/4/6/134696540/1926742.pdf
    • https://rubopawine.weebly.com/uploads/1/3/1/0/131070645/fofeguwixikatu-mifalezizap-vexiwogawatan-jujituf.pdf
    • http://dokukuke.mypressonline.com/solid_waste_disposal_methods.pdf
    • https://gedimonisesejed.weebly.com/uploads/1/3/1/1/131163996/4436191.pdf
    • http://wozovumorawoka.sportsontheweb.net/73116512555.pdf
    • https://wevikafajaxa.weebly.com/uploads/1/3/1/1/131164556/wibosizewo.pdf
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/sutiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dowadotiju/gomirogesewirufenijizox.pdf
    • https://s3.amazonaws.com/numegubowalonan/kemobudaveribasibisufej.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65a.bin
92b76b9fb1ee0f5bc06c20f65e7a31fa82728020432f1731c7f953796fe9f38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 5432 bytes
font_01_sfnt_off0000f89b.bin
a9b01655c98aa55d8b2a57ce6b3c97463796b1f891b479048766f72eb55572f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 10120 bytes
font_02_sfnt_off00011b46.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 4324 bytes

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