Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3b6b55c8cba71c…

MALICIOUS

PDF

71.7 KB Created: 2020-11-11 13:31:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 96eebb61148403e918640e87c8a27881 SHA-1: 759fa882b08a015bd3fe92a3473b3170554700a9 SHA-256: 3c3b6b55c8cba71c3970d63f694dcc0ca6adfc9ec6b14f0f5437b60e7df59b63
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a guide on installing Android APKs. This suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/123?keyword=how+to+install+apk+android+9 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f89a089b46a6.pdfIn PDF document text
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/5d2f9837160a1f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5fa3e7028308d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f9052f465d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f9e9563e10a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5fa78870f368f.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/8a2224e37361c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/faec0edc-2e6c-47d5-8b5c-a8b3013d9075/55483783145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81fd5d4-e07a-4953-88c8-6a3f54403533/lion_beaver_otter_golden_retriever.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c5c613-118e-44d0-ab3d-3ad8103b375b/82978800473.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/gaxojuv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF29 4896 bytes
SHA-256: b7d95b441df4993f5e9cbbb18d89c4b47c5876da41cad1ec16a6d0f92d81feb1
font_01_sfnt_off0000dfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD5 10628 bytes
SHA-256: 38d0c63807884222a32298f53106b7a060e94aab9184b58d19f0b4a65054841b
font_02_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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