Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bd391b66a86020…

MALICIOUS

PDF

74.9 KB Created: 2021-03-21 02:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0edb13269103f707f89e21b19020db18 SHA-1: 30382c114c1dfbff18a46cdb0e77542139dc2571 SHA-256: b6bd391b66a860202a57621ce394025d3e35db7c610e397012e545025374288b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one notable URL pointing to a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links are indicative of malicious activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://kuzutuzo.ru/aws?utm_term=pale+blue+dot+audiobook+read+by+carl+sagan
    • https://cdn-cms.f-static.net/uploads/4412582/normal_601ba79f3129d.pdf
    • http://lijonotogi.scienceontheweb.net/10045818146.pdf
    • http://rulajamizap.getenjoyment.net/most_useful_english_words_with_meaning.pdf
    • http://timinome.getenjoyment.net/the_position_of_poverty.pdf
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fccd991378d6.pdf
    • https://cdn-cms.f-static.net/uploads/4382192/normal_603e39b30eb83.pdf
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5fc760c69ad77.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/9210006.pdf
    • https://static.s123-cdn-static.com/uploads/4530457/normal_60081fd0deb9a.pdf
    • https://ridoduna.weebly.com/uploads/1/3/4/5/134528127/4b41fe8cb9e3f4.pdf
    • http://povisowalikim.scienceontheweb.net/pefuxet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_36e6862212eb41e79534d2370055481e.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_ee41f6ccb937448db6a10b228fac42db.pdf?index=true
    • https://s3.amazonaws.com/zobuwubedak/51927715424.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_e0fd91d3b8d7421fa90b6bc27e579203.pdf?index=true
    • https://uploads.strikinglycdn.com/files/718db829-de92-48c1-ac4a-8d7bb31e650c/bissell_little_green_formula_substitute.pdf
    • https://uploads.strikinglycdn.com/files/ee028771-286d-4638-9759-5b640808c6b9/nuradowateze.pdf
    • https://uploads.strikinglycdn.com/files/26adcb05-98ca-4e18-9e53-e82c1cb56864/nikon_d5200_price_best_buy.pdf
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_65360cae217f41d2a9efce9544e2263f.pdf?index=true
    • https://s3.amazonaws.com/lazolu/mafaxazawi.pdf
    • https://uploads.strikinglycdn.com/files/bcf40e5e-cf9e-4027-a2fe-5b42c3117199/ap_seminar_irr_rubric_with_scoring_notes.pdf
    • http://feferabi.atwebpages.com/algebra_formulas_for_ssc_cgl.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e0.bin
38e008a4b169f284e5058a5e8f2f0a036ba232c1b94101884ad582caaf6f6966		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 5416 bytes
font_01_sfnt_off0000f460.bin
ec5e4d8bd80e563b214e82f5308df1092e97dffa37893483aa7d73362f2119da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 11756 bytes

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