Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4cb21fff810ecb…

MALICIOUS

PDF

68.1 KB Created: 2020-11-17 17:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 35e60c65d4cce79e47d2ad5c443e8d1f SHA-1: 74447ff31e3c11b94e92f1d11ecfbcb1e1856904 SHA-256: 5d4cb21fff810ecb00389b473993c80c1f4a850f1a7aaaabe18559737a922ddb
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 identified as a malicious redirector. This suggests the document is designed to lead users to malicious websites, potentially for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://ggtraff.ru/123?utm_term=page+middle+school+supply+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413362/normal_5f95531223ea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f895c72eb9f0.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/903d0253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5f98859f6ef9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f8dfad1b4430.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/sugosubexez/39536776706.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/thermospa_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58cd489e-0430-400d-9960-4967fba98491/kuzufazazipirikaxup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e5f5d5-6bfa-4ea8-b4b8-eb27c37747e6/wunalurogozovej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f832c6-1d16-47a0-899c-25cb113e2f3e/23502578071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7bfd14-20d6-41f9-93eb-d731fbd0f277/vivovibajefamumixe.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_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 5496 bytes
SHA-256: e09035b48d15449fb4135b2c01d4768a99a06fb852118a12c6759d2ccc2eb02c
font_01_sfnt_off0000de71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE71 11000 bytes
SHA-256: 595d874e5c87e6912ed28484e2279fba606f55a264c914e89612367b46b3178d

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