Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07f3476fd4cb652…

MALICIOUS

PDF

71.3 KB Created: 2021-03-12 19:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b981ebb66c038adb0f242aea54fc508 SHA-1: 97ac6dfca2c4b9210787ee7f16f051978bcd2cfb SHA-256: f07f3476fd4cb6522f044e30d80cb1c707db8381d99144669da7996b6c7dba34
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 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

  • 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://druttle.ru/strik?utm_term=what+does+a+bank+compliance+manager+do PDF link annotation
    • https://walipovagotil.weebly.com/uploads/1/3/6/0/136016519/wixukotiz-jenuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/jjRlie8/92488950573.pdfIn PDF document text
    • https://cdn.sqhk.co/rosavuzezig/xha19gi/begaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/Iigichf/xarunelisunilonuwuba.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/tilasorezokumogelegirufi.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/b22b378002e4f8.pdfIn PDF document text
    • https://nufujemirifo.weebly.com/uploads/1/3/4/8/134868255/79785e5308.pdfIn PDF document text
    • https://sowujapureku.weebly.com/uploads/1/3/0/9/130969862/zaxolerutolawev-lakegoxodegig-lalamirufaxubi.pdfIn PDF document text
    • https://lagubezawepafu.weebly.com/uploads/1/3/1/8/131856446/9ef032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_60372af0210f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459341/normal_5fce568829002.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/ibagjeQ/96637636848.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/1307465.pdfIn PDF document text
    • https://cdn.sqhk.co/xarobumevux/h4Gzfic/download_game_angel_stone_rpg_mod_apk.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/bfe9507ab13a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bototiluwoge.atwebpages.com/60318667918.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 5704 bytes
SHA-256: a544579657942061b7d55e726f1bd1d005d337cd8e1f72433d1cef4c467bddbf
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 9964 bytes
SHA-256: b580e44ff1e8c0eb0bcba2c6fbf377e4042edc36f4a52a527856b2cc138f2652

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