Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ded01385ab88b9…

MALICIOUS

PDF

78.5 KB Created: 2021-01-01 07:29:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d95aacbba0f37abe7d315a33b1797b41 SHA-1: d47ca7cc80f5b136cd2e5265dd953344684ccc37 SHA-256: b9ded01385ab88b90138ec707f66de38487f86f8246dab09c04f142a74170305
214 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded links, with at least one identified as a malicious redirector and others forming a link farm. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=basketball+slam+dunk+games In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
    • https://dunidapakepew.weebly.com/uploads/1/3/4/3/134319263/gojiwaxavoli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fb9633b49de8.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/Rhcgjid/tefolubedupotavofi.pdfIn PDF document text
    • https://cdn.sqhk.co/tulazofava/vjjhaia/kung_fu_panda_3_netflix_canada.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/51beb698-52a4-4c92-801c-21f6ea1aa974/milady_barber_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e1aa68-e4cc-4792-833f-1d3af0cf3894/41225546825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d804793-489b-4232-a580-cdaac69047a7/loxasenot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd932a05-59ea-49fa-91be-dbacc4c4051d/56588678226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be299e0b-4ac3-43cd-8286-21827537b01b/moonlight_sonata_piano_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43a4d9c-82d7-489e-8248-dbf7ae275486/50868139816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aca8c3-25a4-4258-ad54-852e4c557721/23778762674.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 5304 bytes
SHA-256: ab24f1fbb78611d345a796a6148dc3808f06b89b472b6b9869c07e6998492fc0
font_01_sfnt_off0000f2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B7 10968 bytes
SHA-256: 7adff8434dcd1966a347d219cc456520aae04b4226f8e89aafcf52b9286826bc
font_02_sfnt_off0001184b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184B 16092 bytes
SHA-256: c9557d91917e40dbb2ce09b7ef560a04a9a832ffe2ebcac6b50408a58351272e

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