Malicious PDF — malware analysis report

Static analysis result for SHA-256 a171a9433c395047…

MALICIOUS

PDF

45.1 KB Created: 2020-11-07 08:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: ce1f3d67f91e57b95324191a3669e228 SHA-1: a0c4eb91677086158fa244905e499f651b617059 SHA-256: a171a9433c395047a26eb180c1a3ca906b65dd59ffbe11b96df692be3424b0db
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • 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.
  • 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://trafficel.ru/wb?keyword=free%20fire%20mod%20apk%20download%202019 PDF link annotation
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/3279488.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/ximanazopenivunepuma.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/lazolen.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/5de21d7d-9e7c-4e71-8be2-2c4473aec0aa/37535645594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f825e7ed-3dd5-4ff5-b943-0a0e6427aae3/payment_request_letter.pdfIn PDF document text
    • https://xoruxosaj.files.wordpress.com/2020/11/6518121005.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac4ae4e-7917-48da-9ea6-d4ad4d5a30ea/jewenagasakobomidimofe.pdfIn PDF document text
    • https://fidunonip.files.wordpress.com/2020/11/madelizopididam.pdfIn PDF document text
    • https://woxawekobati.files.wordpress.com/2020/11/jebowekusesumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e9a812-3d6d-48a1-92a2-5d15c301345a/3136572284.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/24183260139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56cb89df-5495-4246-a38c-99a715c1bc2a/chapter_35_nervous_system_vocabulary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685fbdfd-ee82-4460-807b-e783ddb2fb78/xofikirijevabasixusufodof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d96b7c-4511-4cb9-98d6-7db62255d89c/70885493013.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/94763408831.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_off00007075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7075 5600 bytes
SHA-256: ab3e083c8990d3d10243a1ca9bee6643e803c18ab9e3ecaf79eefb564a5a569e
font_01_sfnt_off00008386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8386 10632 bytes
SHA-256: 1258c66d0470b65d9b44116ffe453c79e08b371f7662b23fdce68d63d1de40fc

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