Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed54f64b8caa6191…

MALICIOUS

PDF

68.0 KB Created: 2020-12-04 14:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 5948c26e87247be4924b8c18c48f3e21 SHA-1: 525440e4fb489b4f1516cb8250736f7c5ec9c140 SHA-256: ed54f64b8caa6191de42e8b88a39fa3e9048ee725b7bdc2887c00fdae0651d3a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or phishing attempt. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous links and the heuristic firings strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/123?utm_term=paintball+sentry+guns In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fc5724f3912a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_5fba70eba72de.pdfIn PDF document text
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/dazowikivelu-xekinosokizew-nuwamafi.pdfIn PDF document text
    • https://kupejofep.weebly.com/uploads/1/3/4/5/134589233/bunulisufukoranomira.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/zunewidimem/tubi_tv_activate_code_roku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e3243e-fa68-48a3-a0ee-d24293ed4a4c/rusobupusotawivivekixew.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0fc561e25426e100782f/1606291398133/ninja_ultimate_kitchen_system_bl820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733ec650-45f9-42bf-8c99-6c478f02bd00/61837601320.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/57566271204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/311c087f-8baa-4708-8ab0-37274bc51550/90583725012.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/hacked_last_stand.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/deruf.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/validity_in_research_methodology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d6e901-f3f5-4339-a04e-cf5a83a99d45/chatham_county_nc_inmate_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf1b90c-1056-4456-84ed-1f48b6865989/stellaris_empire_builds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a3752d-a6d0-47a3-96ab-2d2929c2a843/42554346740.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_off0000ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE83 5096 bytes
SHA-256: adfe520a21bbdf6d59bbf246d3ab6f026d534adeee96aef96e1ccabaa4e96b4c
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 10504 bytes
SHA-256: cd1fa27ac2eae876c6816c7766a66b008f1ed155b38cc439b45b9c2c52f4f528

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