Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb68a57e48cfd6b…

MALICIOUS

PDF

40.6 KB Created: 2020-03-20 05:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1e7237b35674759bccdaa3c88964812a SHA-1: 33464e706762f4ba4de48cf794fc37da781ef2d3 SHA-256: feb68a57e48cfd6b675d88d083b650b5835a4172e54b5047a96da4fa5e0529de
94 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to other PDF documents. The ML classifier strongly flagged this sample as malicious. The primary attack pattern involves redirecting users through a network of SEO-optimized PDF files, likely to a malicious payload or phishing site. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://christinabeautyparlour.com/uploads/1/3/0/7/130740175/130740175.html#santa+veronica+giuliani+film
    • http://cpanel.littlecreekfarmllc.com/uploads/1/3/0/6/130620902/zupitefabowizaruton.pdf
    • http://organik-zeytinyaglari.com/uploads/1/3/0/2/130272488/folinexoni.pdf
    • http://brewingforequity.org/uploads/1/3/0/5/130589354/6a0a365c1b1.pdf
    • http://newberryrentals.com/uploads/1/3/0/4/130483690/mudeviximexasixuf.pdf
    • http://www.microbladingbyrose.co.uk/uploads/1/3/0/6/130604580/9622264.pdf
    • http://millennialstitcher.com/uploads/1/3/0/7/130776449/mosasurasafogodorax.pdf
    • http://www.davidsethg.com/uploads/1/3/0/7/130739490/musitemurujavaw.pdf
    • http://74-123-72-207.mgwnet.com/uploads/1/3/0/4/130483285/pekak_nanokojawenuda_tigiw_gabapuzixinalo.pdf
    • http://forestacresmusicschool.org/uploads/1/3/0/2/130287886/xulafopivewa.pdf
    • http://myopoa.com/uploads/1/3/0/2/130273788/931076818.pdf
    • http://ftp.nazdorovya.com/uploads/1/3/0/6/130603935/2d2a7fb0.pdf
    • http://quietland.com/uploads/1/3/0/8/130814328/zetajox.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007449.bin
b27a7c52e1f01115199bcc6a228d012bd31a7fa26481aa5daa12e57211c8c4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7449 9288 bytes

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