Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb422d434eaa1b…

MALICIOUS

PDF

76.0 KB Created: 2021-05-30 12:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab9d5f1f0b130242f144e6731e4e9ebc SHA-1: cebf42cf0ef7a6398abd7c4912de06e0533ff453 SHA-256: fdcb422d434eaa1bc4408eb86f03c97fe734cd9bc720addf08274d4be998aac3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious content, likely via embedded JavaScript or similar mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/123?utm_term=difference+between+gypsum+board+and+pop+sheet
    • https://zuvixane.weebly.com/uploads/1/3/0/9/130969636/c8f0042b80.pdf
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/pagesekabupijoxoboki.pdf
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6067202f1bd36.pdf
    • https://cdn-cms.f-static.net/uploads/4449996/normal_6032cc5be4cfc.pdf
    • https://cdn-cms.f-static.net/uploads/4446394/normal_6010c8108b9bd.pdf
    • https://cdn-cms.f-static.net/uploads/4487201/normal_600ada750b0f6.pdf
    • https://static.s123-cdn-static.com/uploads/4446019/normal_5fcd6cdfb55cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0aad30ff-a264-4b0a-bd12-d90ede34abb8/30527936655.pdf
    • https://uploads.strikinglycdn.com/files/e466076f-ba98-4eca-93e1-7ce7efe23b1f/taxonomivunewinigeti.pdf
    • https://uploads.strikinglycdn.com/files/06c988fd-cc7d-4d63-ac7e-f78e22ce7568/types_of_decision_making_models_in_management.pdf
    • https://uploads.strikinglycdn.com/files/e11ec070-47d9-4f94-95c1-5fb22bfe70e0/wiring_simplified_2020.pdf
    • https://uploads.strikinglycdn.com/files/e8157376-55ca-4625-98c5-83d02b38203a/wisafimozexesafor.pdf
    • https://uploads.strikinglycdn.com/files/4d7b2e5f-fcaf-4f5e-bc33-487e37dcfa00/11312541666.pdf
    • https://uploads.strikinglycdn.com/files/7210ab99-5cf3-4577-b2a3-778bf5e10378/best_french_door_counter_depth_refrigerator_2018.pdf
    • https://uploads.strikinglycdn.com/files/1d34a1bd-5342-442f-b325-87474d8f28e1/bupafikulobelugileto.pdf
    • https://uploads.strikinglycdn.com/files/62bd0086-90f4-42b5-836e-46fc52c196f5/jane_austen_society_book_characters.pdf
    • https://uploads.strikinglycdn.com/files/912681f1-682f-4a34-91c4-f52a96072eed/what_is_covered_under_chrysler_lifetime_warranty.pdf
    • https://uploads.strikinglycdn.com/files/e1754688-8c6d-4bbd-b15f-1576ade882a8/oraciones_subordinadas_adjetivas_ejercicios_resueltos.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e0.bin
d653a1dc996535086c6cce571f12554cc93607554baf4b03cf7625ec689875d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 5868 bytes
font_01_sfnt_off0000fdcf.bin
bd41d2eb08ed4975bc6736bcc668bb486d03d7abba055850d9fda66366c5f0c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10936 bytes

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