Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd43520afbbf632e…

MALICIOUS

PDF

66.1 KB Created: 2020-12-19 09:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 059c1ce351aa8a5c5fac55524f2211dc SHA-1: 82b8dc4ca0fd568236fa94e16bc1f2704eec67fe SHA-256: dd43520afbbf632e9118ec65f1a413c2ed8cdee6b06cf91b7cea6f5f14f54e1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=tree+diagram+worksheet+7th+grade PDF link annotation
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/wewesi-duwuvexasubifaw.pdfIn PDF document text
    • https://nirilepewo.weebly.com/uploads/1/3/4/6/134657632/3588030.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/6372972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5f99a00fac389.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/2628777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5faac62aa1e06.pdfIn PDF document text
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/7415686.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/zebarufuridorur/cambridge_ielts_9_reading_test_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf6e92a-7e04-4740-a4b2-c86f6f333923/humana_medicare_medical_policy_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd231d3-25a7-4803-947d-9a9af8da605d/67872229397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71250f76-a8f2-403c-931e-792f5089e202/66826925955.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/audio_video_converter_app_for_android.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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 5392 bytes
SHA-256: 7f435916eba388191d19e7d4997afb13681e8a28396bb49652349af0de8fd071
font_01_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10440 bytes
SHA-256: 22ec5d2d3b1ce012801d00217ed1ecdd05752d22aee137bc894b60c9c391881c

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