Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3ef4b4b03ad182…

MALICIOUS

PDF

64.5 KB Created: 2020-11-08 04:05:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a0847a217ab8c3461e6b34c5eefd3008 SHA-1: 28389850a6746278aa529a214fc901103ead3002 SHA-256: bb3ef4b4b03ad182ea714a991224f6071b52bb983a4a71afbb07f20cb18fbbe2
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

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.
  • 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://trafficel.ru/123?keyword=ed+miracle+shake PDF link annotation
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/nebisilit_rosexuv_datatubuwudu_tewewub.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/kivijejud.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/sanapedukeputup.pdfIn PDF document text
    • https://tokenabasefegaw.weebly.com/uploads/1/3/3/9/133999291/1d2dfdbb2301241.pdfIn PDF document text
    • https://pokezivakizame.weebly.com/uploads/1/3/4/6/134619377/punusijuzoxutowawido.pdfIn PDF document text
    • https://ligexomapaku.weebly.com/uploads/1/3/4/3/134321337/wisebik.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/60febb.pdfIn PDF document text
    • https://wakutoji.weebly.com/uploads/1/3/4/3/134314583/mimedi_magavaza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/dallas_craigslist_motorcycles.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/53411681966.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_off0000be45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE45 5200 bytes
SHA-256: e9a1678dd78023b1c1acb7468312d4e9e7b6e42066e413c5e1842c3cd61da8c4
font_01_sfnt_off0000cfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC2 11236 bytes
SHA-256: 02d64bbead9e555c16659e5e7c1445a39b23e7203267ed48878c7b291d8f1cbc

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