Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54bcbcafc87bbba…

MALICIOUS

PDF

63.9 KB Created: 2020-12-31 07:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 92b4d889f0012e2b7a9dd161b4801f3d SHA-1: 70316ee0a34c9f2f5c10c6c316d0f73e24c32321 SHA-256: d54bcbcafc87bbbaae1dbabce40958f419683263dfd10f96cbf242d99c047ef4
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a PDF link farm. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious links. The primary attack pattern involves directing users to external URLs, likely for phishing or malware distribution, which aligns with the characteristics of a malicious PDF document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://traffine.ru/strik?utm_term=tower+color+ios In PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/96f535a571bb058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5fa86ad4d82dd.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/ieBi4ok/find_my_friends_apple_ios_13.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/jhhdehj/elements_definition_biology.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varoximu/93411514535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171698db-918e-4b78-b7e4-385d0fdee715/xiximasodepexosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7101dbc4-5b85-4100-ab61-7d4f42d0dc15/73337508212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91742b71-d881-4e2f-bc1f-b8b0e341ac43/kanitafuwej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5816adbe-965e-413b-9372-cf9d58070c18/tab_a_model_sm-t350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd051b57-ffdb-4afd-a4fd-3584016308b0/best_buy_liberty_mo.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_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 4624 bytes
SHA-256: 75e2ff1b6a22d8fc58bbc846965a7004b5abaaf641433562da015db37b25cd22
font_01_sfnt_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 10488 bytes
SHA-256: 47c22bf954ac73c6c824aac655a93eea6f16c0e1f1a87228cb522be33b68a7b1

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