Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4ce0f118d2665b…

MALICIOUS

PDF

85.3 KB Created: 2021-03-31 20:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad80f3c52a7dbfc6286276c7094c5621 SHA-1: 705877bca824a3a18f49d9607ce5df5c039677cb SHA-256: ac4ce0f118d2665b4e1c5475c6cf41b2c70b5e0c08d113da47f61999a452df55
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://dugedepap.ru/award?keyword=brochure+design+ideas+pdf+free+download PDF link annotation
    • https://fijitedutim.weebly.com/uploads/1/3/1/1/131164269/5143622.pdfIn PDF document text
    • http://fortuneo-enligne.com/anandam_mp4_video_songs_freef3sxe.pdfIn PDF document text
    • http://magazinrf.xyz/69028928562m1cc5.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/4866775.pdfIn PDF document text
    • http://kmplitka.shop/xewadunepasodugazlmm7r.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/busidovuzezudim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fcb2b3ca804b.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/denododogu5yaif.pdfIn PDF document text
    • https://teroxomiguwadi.weebly.com/uploads/1/3/1/3/131380052/jixiwarulana.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445104/normal_6003db893f564.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/32406e52-eb89-4125-8382-b3e73629a436/what_are_the_three_major_periods_of_egyptian_history.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5f3abe-47ce-4c4c-8ac5-c492d54489dc/61783451146.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/maravilloso_desastre_sinopsis_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/nitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fb14ce-cce7-4f65-935a-680839b02cad/el_1_es_un_palito_el_2_es_un_patito_cancion_infantil.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_off000110c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 5556 bytes
SHA-256: 4dcba140f3ca9d2c56c70d761b26d938fa41db191e969a037c57c53c39b6e8a4
font_01_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 10760 bytes
SHA-256: e7a9dfc9ca1ff85045375230ccdfc615634086d8f4c59144db299cd7fd80d3b8

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