Malicious PDF — malware analysis report

Static analysis result for SHA-256 898f8e11779105a8…

MALICIOUS

PDF

70.8 KB Created: 2021-04-16 05:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 58aa88ccb61451324ab0eece4e098776 SHA-1: 6a49c63923cbb0564ea0bbaa7b44bbb1a2b7f8c1 SHA-256: 898f8e11779105a8d1619a3c213baae8e80c72d340a6a8f9ebfcf5b22ffcfee6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and a potential phishing/malware distribution vector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://midufefew.ru/strik?utm_term=best+piano+method+book+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497344/normal_604d22fb31793.pdfIn PDF document text
    • http://melowew.scienceontheweb.net/mcdougal_littell_algebra_2_practice_workbook_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413977/normal_60107afba7dbc.pdfIn PDF document text
    • http://rabekapudi.iblogger.org/16413676100.pdfIn PDF document text
    • http://vawurabel.mygamesonline.org/harcourt_grammar_practice_book_grade_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_60597f5d12ea0.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/zunokedezijumesixu.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/butemigo_ketero_suzamogokuta_mufog.pdfIn PDF document text
    • https://kevefizi.weebly.com/uploads/1/3/1/8/131871405/3687221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_60571d23e43e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_60630a3fb6a01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugeritubaduw.epizy.com/tojukurisoxed.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_db171f096d624ba4ac171fdadb59d9e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23702bd1-f189-4cab-8ade-ea5ba27ba9d2/maze_runner_death_cure_full_movie_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c44ed3d-554b-4876-b696-936c1d0bd36f/bimovelu.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_6f52a8a45a364ee1883bb853fda0b66e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/49bcfd33-6b02-4a13-b413-96607f7d9be0/are_the_mandalorians_a_race.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6b59e86047834669a3c6105a31c869ca.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_70c376e6883943bea835b4bd4dcbc7ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30172e96-5986-4e2d-b841-97b84c748b6d/pobudodeloke.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/how_to_breed_perfect_iv_pokemon_ultra_moon.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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 5420 bytes
SHA-256: 90b7b3093d2aab160e19ee637e28ca3df799f2e869a959196e6208b056918b7e
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10532 bytes
SHA-256: d5731bb823db7db95a2b45f359ea275a660dec4371bfd33f8c06d2760e4346cd

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