Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33739194f12d79…

MALICIOUS

PDF

69.3 KB Created: 2020-12-24 00:11:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbffcfbc0bf310e259b5f5f565aa65ed SHA-1: 8b1e0ac83355828f3884782543545be8a5d25e1b SHA-256: cb33739194f12d792c4be83a1984129fc8e81e2827181c10a98ddafb5bb108e6
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, including a known malicious redirector, suggesting an attempt to lead the user to a compromised or malicious site. The heuristic firings indicate the PDF is designed as a link farm and contains malicious redirector links, strongly suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links points towards an exploitation attempt.

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/wb?keyword=walkthrough%20of%20among%20us%20gameplay%20imposter In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5faff5a17c526.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/3734855.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/4e161b6d8.pdfIn PDF document text
    • https://liwavijej.weebly.com/uploads/1/3/4/3/134379327/9780601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5f88fec3c6f58.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/79775635-5a61-48f0-a3f0-5369c605b40d/gun_master_3_zombie_slayer_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7547eb-0fa5-44cc-9237-231d43b38fbb/fajabijexovupotovefeka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43b0fa9-be92-4809-bd5e-3938f2b2a4b3/tonepadapasesa.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/free_birthday_party_invitation_templates_for_publisher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97d921e6-7303-44ac-a1de-5a7c3138d70b/niruluzafatutovuvu.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_off0000d2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 5492 bytes
SHA-256: a2c77b5594180bd545f4ee55e91f531a51a4019f6871246b19ad34ad7fd7a592
font_01_sfnt_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10492 bytes
SHA-256: 5057eba9b09dbee150230026f3f5acd27e3844a3bd6b30e26fa3c502ed611864

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