Malicious PDF — malware analysis report

Static analysis result for SHA-256 80535c9ef5f74770…

MALICIOUS

PDF

38.1 KB Created: 2020-06-05 01:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86584da073cd46b3122ba9ed6ddd5834 SHA-1: b6f65c8bca7dbd89356574b1f15d3316b257aba4 SHA-256: 80535c9ef5f74770aab75214a8421054760966102692f7718e51e74f63fea5ac
104 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on similar domains. This pattern is indicative of a link farm or SEO manipulation tactic, often used to obscure malicious activity or distribute further payloads. While no scripts were directly extracted, the PDF structure and the ML classifier strongly suggest malicious intent.

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.
  • 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 http://hottonerink.com/uploads/1/3/0/7/130740492/130740492.html#lefty+righty+christmas+game
    • http://rayginediaquoi.com/uploads/1/3/0/2/130289218/retusapujawesebunoko.pdf
    • http://shoplakelifeco.net/uploads/1/3/0/6/130604113/gijebajoler-lafuta-midolajok.pdf
    • http://womenheartwestdenver.org/uploads/1/3/1/4/131438121/naxatasufopivop.pdf
    • http://mtzionmachine.com/uploads/1/3/1/6/131637311/ganixilinabumom_butoxul_midafefonin.pdf
    • http://luxxe-white-by-ac-88.com/uploads/1/3/0/5/130589399/vepolezekudos-kakilaparakape-lugix.pdf
    • http://3003exposition.com/uploads/1/3/0/4/130435666/9038027.pdf
    • http://boulderbeachsidecafe.com/uploads/1/3/0/7/130775384/65cf18.pdf
    • http://hottonerink.com/uploads/1/3/0/7/130740492/terms.html
    • http://hottonerink.com/uploads/1/3/0/7/130740492/dmca.html
    • http://hottonerink.com/uploads/1/3/0/7/130740492/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ratuwig.files.wordpress.com/2020/06/42600326224.pdf
    • https://fazasoz415563789.files.wordpress.com/2020/06/gipeji.pdf
    • https://rawujax.files.wordpress.com/2020/06/texodop.pdf
    • https://wupojawafosa.files.wordpress.com/2020/06/24473534910.pdf
    • https://boduwifa.files.wordpress.com/2020/06/95699424948.pdf
    • https://weduzame.files.wordpress.com/2020/06/46056554676.pdf
    • https://puvunitulev448898520.files.wordpress.com/2020/06/wulawewuzexowumibawe.pdf
    • https://fujipoveju.files.wordpress.com/2020/06/karisewemerewemuvifiti.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006855.bin
85e554bfecbd5573c532110b32f4a76c0df644bd0d04b1d8d091e0d23db7bf25
pdf-font-stream PDF embedded font (sfnt) at offset 0x6855 10564 bytes