Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d07eab8244919a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 03:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b1bfd99f6aaca1281b4a97f6e7927203 SHA-1: ed2618047e18b0d1282ad3600823bd0a440424d0 SHA-256: 87d07eab8244919aedd1a183b71ae822e72be9f9ccc47cd86b8fcd289428a70b
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 hosting, and one specifically targets a product search term. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/wix?keyword=anker+usb+3.0+to+sata+converter PDF link annotation
    • http://mazers.fun/completing_the_square_review_worksheet_answersvprwq.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/SYlGGgj/catfish_picture_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/c5qB5ib/20124717162.pdfIn PDF document text
    • http://closemaze.com/215878340535n7ka.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/zeximo.pdfIn PDF document text
    • https://cdn.sqhk.co/fiduzosi/geShhif/hotstar_url_video_er_online.pdfIn PDF document text
    • http://itayoga.space/35490081607z5qek.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/6011546.pdfIn PDF document text
    • https://jawenovexexadu.weebly.com/uploads/1/3/4/0/134012785/8343686.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/SEB4gfw/56872981639.pdfIn PDF document text
    • https://cdn.sqhk.co/dobusalebed/figS5hd/93888459864.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/56904249754.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_7da9160a6a3849a28ade162d3e001bf5.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_8c504934b4b94567b5b34f3afd4c7e9e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/best_interior_design_colleges_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/fozezabajodarazi.pdfIn PDF document text
    • http://tezidenu.epizy.com/wososubovevusijufe.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_82e52f6a78344a7c8cd03a2c646c3cea.pdf?index=trueIn PDF document text
    • http://nejabet.epizy.com/beestar_math_worksheets.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_696ce116e49d40ccb1a15ce77d081ef6.pdf?index=trueIn PDF document text
    • http://roxixelojoxas.rf.gd/ielts_reading_50.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/26484812420.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/gimela.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_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 5352 bytes
SHA-256: 494bbddcd1c954df4853a11e6daee249f9117a7e24c4a3720cf6d93525350283
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 10644 bytes
SHA-256: 152760757a732970c02b90e6b75fef20583632a5deba6cd9bd145e93bb3caffc

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