Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b33178578159ad1…

MALICIOUS

PDF

73.6 KB Created: 2021-01-03 12:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 066743e3c02b9612d9a416ad13270686 SHA-1: 97f334d87e69a665e26f1b4c2cf8582a1a93a064 SHA-256: 8b33178578159ad1aae6bb864350f52e11a2cd3a7e1bfe67f709a9887eb2bcd3
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves redirecting users to external sites, likely for phishing or to download further malicious content.

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/aws?utm_term=clip+facebook+ios In PDF document text
    • https://pipalilivo.weebly.com/uploads/1/3/4/3/134310902/ebec36e86.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/a3cdfe292.pdfIn PDF document text
    • https://xudibonazo.weebly.com/uploads/1/3/4/3/134353284/lolovonuloj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410956/normal_5fb27d31eeaf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f8ffdfa0c5b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457847/normal_5fb2a05491cb1.pdfIn PDF document text
    • https://dexoxewivovevub.weebly.com/uploads/1/3/4/3/134322619/66d95cc455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fd2c826c2856.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/3dd92cda-9765-4777-b1a9-bc044768b63c/79879239152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a797bf1f-aaa0-496b-864e-cd955eb8ba6c/notas_de_viaje_che_guevara_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f05839f-7a8a-4a44-8b2c-ca151d7fb2a5/94768348371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290f6b4b-381a-4ec1-b46a-8d00410f3d71/51945197726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acff978d-abfd-4ac6-80bf-4a23d2c71991/cartoon_channels_on_antenna_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/443e1e60-df67-4437-81ff-5c035a3764d3/96652982012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc53bc3f-2088-4915-8233-85f1bb6c0d42/soehnle_scales_manual.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 5020 bytes
SHA-256: 89b12ee6d8c50aa6124a2b7df7d983f82437aad991df25780291f310a0a200e0
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10496 bytes
SHA-256: c1cc3741b64ed97bd439686a3a5f8647e8bab5bd1b8f4e48ba8eca9a41aaf8ec

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