Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb42f4e84b555384…

MALICIOUS

PDF

65.0 KB Created: 2020-11-20 04:55:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c31e67f4cf90dfa01fd7116eb982e1bd SHA-1: d8eca94003ccd465c2976bf6836fd0464adc6573 SHA-256: fb42f4e84b555384e709c59a38a5a7a0c87558b05b156bd09ceb80c573de4052
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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?utm_term=rayna+tyson+instagram PDF link annotation
    • https://xuvosaxefon.weebly.com/uploads/1/3/4/6/134605895/jafenuvifiwux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fa732bf7c7df.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/fugodid_pamakonati_gigule_sotadinesiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5faac865d6c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_5fad7efc8e5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fa4108d8a5ca.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/debiwelof/rational_numbers_class_8_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996c7e9e-2acc-40fc-88a0-23d18101b0cf/22471119025.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/free_online_the_hangover_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/airline_tycoon_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af3cc832-ea9e-4864-a8a6-eba0f2ab3a1a/nfl_kickoff_show_on_fox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5307b830-38b2-4083-8e60-097f6213827d/logaritmo_exercicios_propriedades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa507841-e124-4c28-8608-b84f8bc4a8c7/27002938154.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_off0000b5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FC 4752 bytes
SHA-256: bc9ef957c7b00e4655bc986b14c14a185eef4b5e5d81d14cd12cf4386610836c
font_01_sfnt_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 10024 bytes
SHA-256: d7d3118cd929ba46a9daed2bc0af36c7bd5fe8c3b53cf599f6eebd35cb0538c0
font_02_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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