Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a3e9faf7affc6c…

MALICIOUS

PDF

62.1 KB Created: 2020-12-27 05:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 30bec728c54315a62a7cbbc70e6fe01f SHA-1: 54a57d33949f9ca40739cf996b4e3d1761b592f7 SHA-256: 50a3e9faf7affc6c85ec429bd93814d8b5f4d96cf4d37e77336efa9d1d918058
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=navneet+kaur+dhillon+bikini+photos In PDF document text
    • https://kexejimeso.weebly.com/uploads/1/3/4/0/134096016/ketep_dazag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fe0cdd0803d1.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/AgjDOqe/vibusuvajidoxabilo.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/gijb6gf/3757278423.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/vageratebo.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/abd8a1a0-14cf-4e35-9859-90473060f5f7/xemuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78aa98f-ef70-4983-9414-b570243c97f9/airpod_pro_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a9b8bb-a468-49ae-aae4-d34ca0fdc133/44582199238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f18ac9-390a-456a-b50b-9574c9ec8016/87393829620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77060009-6e70-45f7-b3a4-cb4933afee6d/22328377528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac029c4-995c-419a-8da5-3f954175e40f/nodepuwomimul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bec3af5-6bab-4f09-bb4e-c2fa3432d9da/curiosity_killed_the_cat_but_something_brought_it_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/463b11ab-60a7-437e-8e38-db9aa30c8218/kinh_cau_tong_lanh_thien_than.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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 5280 bytes
SHA-256: 57b76768c07dc6e154733add2bd163e41f9f88965f66c9a60f68e6445da9185c
font_01_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 10112 bytes
SHA-256: accef3f2943a0717486e12855ac30508cced5605a2b003e187b4aa2089bf41a8

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