Malicious PDF — malware analysis report

Static analysis result for SHA-256 723bb2ac70ff71d3…

MALICIOUS

PDF

65.7 KB Created: 2020-11-18 05:18:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee8d9994d43968234bb2919d78455880 SHA-1: 2af5ad392ffb0c1fa21b4961d4128776ea922c09 SHA-256: 723bb2ac70ff71d3afd9a5e780d91a58ee24767102c41e1a725b60bcbae02140
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The presence of an external URI pointing to 'trafftec.ru' and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent, likely phishing or malicious redirection. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=swl+emergency+procedures PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392210/normal_5f9fb8795ec52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5fa0d7bc24f2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_5fa4232dc6ae0.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/jedobaranarazib.pdfIn PDF document text
    • https://dudazesulibo.weebly.com/uploads/1/3/4/6/134639231/sigexekepuzokuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fab2551b4187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5fa1e12eeca7b.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://uploads.strikinglycdn.com/files/deda692a-f1f0-49a3-931f-5f532599579a/63571589107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b0ac3bd-5bb4-46f8-b0bf-6b22e5935db2/roxowojuxes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49fbb7da-89c6-47d0-9ff2-a5fdd778d2d2/bagumapixesizelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802238d2-b6d7-48fe-883a-a098fb62d291/ekg_interpretation_made_incredibly_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057c5aa0-5946-4e95-b4e4-42efa39fd39f/nafelepisunobobox.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/video_call_app_for_java_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/64708951581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e809cabd-994b-470b-ad7e-030b23502477/centro_de_copiado_o_fortin_ramos_mej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1280b38f-cc01-4b9b-b104-473118fa41fd/kitchen_nightmares_season_3_episode_14_full.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_off0000b6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B4 5232 bytes
SHA-256: 50fc18a19982fd9a553fb43b3e77151e1e8963fed77f7da9fde8256c6ceb7fd4
font_01_sfnt_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 9876 bytes
SHA-256: 2e098dd56c247cd7f4bc7d857321b34fa668b2cc6400d61ff1892e5260eae132
font_02_sfnt_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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