Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e470274f8e0dec8…

MALICIOUS

PDF

80.1 KB Created: 2021-02-15 08:57:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 83b0f02be4d0a6386c7ebf72220bb05e SHA-1: 37df33caf480a32686c79c7bf7b7e353e79acfc2 SHA-256: 8e470274f8e0dec8e55dab265fb4e190095f5969cca35900b39564afa9b9df00
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDFs, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' button heuristic further supports a deceptive lure. The ML classifier strongly indicates maliciousness, and the embedded URL points to a suspicious domain, likely serving as a download or redirector for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/123?utm_term=easy+frp+bypass+1.0+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446931/normal_60241c880712d.pdfIn PDF document text
    • https://nebekateri.weebly.com/uploads/1/3/1/1/131164314/7469788.pdfIn PDF document text
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/2131341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_6017082f9b21d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_5fe9ca7cdc23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_6018c6a8ca472.pdfIn PDF document text
    • https://bunadijora.weebly.com/uploads/1/3/4/4/134432215/mejexizuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_601cd74134163.pdfIn PDF document text
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/tavabijugekuvi_fitexezoxadeg_mavizomi.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://s3.amazonaws.com/wujapu/72942304006.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/android_studio_offline_installer_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/brahmachari_tamil_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/informatica_cloud_data_integration_developer_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/nj_saltwater_fishing_regulations_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/filidabut/business_loan_agreement_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/platform_as_a_service_paas_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/facebook_video_app_store.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 4680 bytes
SHA-256: cb393e96f9197c2694c2208d70f2cc96a29f95199d89c32a958a70ba0a0b87cb
font_01_sfnt_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 14016 bytes
SHA-256: 976bb80088e0d419ea41162507ad7b7414d5c806d507e34847f7656c27882f9f
font_02_sfnt_off000124d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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