Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a637fe835fc07ba…

MALICIOUS

PDF

57.9 KB Created: 2020-11-10 12:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2ead28630f603a2c9090a43cc281e086 SHA-1: 147c31921233068a594138eba171215b80db44a9 SHA-256: 4a637fe835fc07ba840d1c2172dc01163a323eeec23e2d9cbc5feea63013b60f
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 0.9996

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/aws?keyword=rate+my+professor+usf+tampa PDF link annotation
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/vedojus.pdfIn PDF document text
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/fedomixugebarupisal.pdfIn PDF document text
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/lozuwivifagone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8c043e237e1.pdfIn PDF document text
    • https://saxepuxuk.weebly.com/uploads/1/3/4/4/134472003/8b9caeffe8.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/6a75fef7-cd40-4414-b719-916992516a12/wukakefuvurimixorimujo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/vabudofudi.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/agreement_contract_template.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/jedujilinotivisodoponoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fabc433-e56a-41c0-9116-fcd58e72c127/vojusiraputukipogutaduxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/76302803751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7a88af-0975-4b93-a6e9-1756dec14f31/94715165539.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_off0000a9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9FC 5124 bytes
SHA-256: 1c7e9b65001a12375fea10e1fffd6402ad396862d50b74145265e32e48e92972
font_01_sfnt_off0000bb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB61 9348 bytes
SHA-256: 8c76ceefce5360d6b4eb191950de54d3c029c7a202a1dbc1291d1a27bc692e26

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