Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b172f5ba8786d2c…

MALICIOUS

PDF

69.6 KB Created: 2020-11-23 21:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fd87949146b5e029dfab3dd95993c9d3 SHA-1: 7cb5d9fe0e4325ad77712be61f8bcbc9e762b52e SHA-256: 9b172f5ba8786d2c32223f993c393cfb1c6d8d7a67e7fdc7233960d92d2b0c63
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://trafffi.ru/123?utm_term=ecology+exam+review+answers PDF link annotation
    • https://simomoluxaruto.weebly.com/uploads/1/3/4/8/134859410/8242282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87638a1d135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5f9ba1ddcf2d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389352/normal_5f8fd9a3d4ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454811/normal_5fa031ade8a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_5f987fd620947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5f9b0222592ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451970/normal_5fa130ea79b97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5fb2e39727146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5fba2e2c6af34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f8c124610321.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://s3.amazonaws.com/votuweroxigezog/facebook_lite_messenger_app_apk.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_off0000c64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64D 5108 bytes
SHA-256: 84507fb6280f1b6b2b2d6eeb549b12b2e8713b64b127cc58716a4c6c2c025e49
font_01_sfnt_off0000d7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A2 10584 bytes
SHA-256: 11428fb455a543e5622b86bd7e80e69d3563927a4c41ab79862d6a26a677f5e5
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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