Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc123902d875d2ba…

MALICIOUS

PDF

61.3 KB Created: 2020-11-06 09:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8f1db441fa97b97ceb45416b2122c9b1 SHA-1: b796ba397f92e3e2acd79b7d8a81488fb5c7047d SHA-256: dc123902d875d2ba4ca484ce13f228edc7f5061bf9c8992af21ff01bef216951
96 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating a link farm and an embedded URL pointing to a suspicious domain, likely intended to redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to a malicious site, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://trafficel.ru/123?keyword=silver+linings+playbook+script+pdf PDF link annotation
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/b532ee0a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_5f98180db7483.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/f3a21d1a971.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_5f915d9d20c0c.pdfIn PDF document text
    • https://pewoxunoxosizix.weebly.com/uploads/1/3/4/3/134318290/piput_bowok_lexivuwe_livajonafola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5f9de8c42b37c.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/f53ff955-2e7d-42df-b3b7-f91cc79df5f8/honeywell_smart_thermostat_rth9580wf_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46284b4e-8a1e-4042-b83f-92e50de82b93/puzakob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c13505c-eba9-409b-8b11-e9108c2a98b5/91037330832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7f6a00-0853-457e-8711-16182bf6d688/comparatif_superlatif_anglais_exercice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24046a88-0d9a-4642-b848-aa4bc36d256b/blood_typing_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf0f294-4732-49c7-848e-8ae42c91568e/how_to_download_episodes_from_123mov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fe6d0bc-bb16-4f82-94e8-39cc24adaa12/drivers_license_renewal_cost_in_oklahoma.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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 5792 bytes
SHA-256: a81098f3e46611a3b2a9f31f583ab95cf4bff2c422adc233bbd8e0719bad42d6
font_01_sfnt_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 11148 bytes
SHA-256: 3965dd455fe4e615ccbd1da853376186238512dd22d9a91aaee10ff4f760f30a

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