Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a592c25f823050…

MALICIOUS

PDF

38.6 KB Created: 2020-06-12 05:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8753ba12cc1ebd8717c027b1e12003b SHA-1: bcd93a02fe88841160695c07da7f39cba5696d13 SHA-256: 66a592c25f823050825003e75fb4992cf5688ef1537894dd3b1a067aa61b3725
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified as a link farm, pointing to various domains. The ML classifier strongly indicates maliciousness, and the PDF structure suggests an attempt to manipulate search engine results or distribute content from numerous external sources. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://myrestingstitchface.com/uploads/1/3/0/2/130288520/130288520.html#real+time+radiography+pdf
    • http://kultcherinvazion.com/uploads/1/3/1/0/131070207/5f95f9a27b.pdf
    • http://foryourearstodrink.com/uploads/1/3/1/4/131483547/talikaburoj.pdf
    • http://djshieldssquare.com/uploads/1/3/0/7/130776152/7360101.pdf
    • http://realfredrosser.com/uploads/1/3/0/6/130620469/3934326.pdf
    • http://honeybeepollinationservice.com/uploads/1/3/0/7/130776403/gaxepureg.pdf
    • http://npcmutantmuscle.com/uploads/1/3/0/5/130544672/424b5c2ce.pdf
    • http://mail.calvarynewlifesa.net/uploads/1/3/0/3/130313343/vakiduvijojud.pdf
    • http://server.wallybissett.com/uploads/1/3/1/4/131437443/f7477b01b231.pdf
    • http://minkandmann.com/uploads/1/3/0/4/130436306/8779477.pdf
    • http://306n3rd.com/uploads/1/3/0/8/130814416/a25edaab09.pdf
    • http://wishshape.com/uploads/1/3/1/3/131380177/loxakukidu.pdf
    • http://mediaqueens.com/uploads/1/3/0/7/130740158/fopuxolawe.pdf
    • http://mrsindler.com/uploads/1/3/0/4/130483833/1df4346.pdf
    • http://wandameadows.com/uploads/1/2/9/3/129358494/129358494.html?mobdro
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://suzabuse.files.wordpress.com/2020/06/82118854264.pdf
    • https://xuwapiz942495240.files.wordpress.com/2020/06/fokopibanujokaka.pdf
    • https://zisifexuse.files.wordpress.com/2020/06/pobamezagogezixawij.pdf
    • https://vebetume.files.wordpress.com/2020/06/70480758205.pdf
    • https://tonuder17045888.files.wordpress.com/2020/06/96559158868.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_off0000696f.bin
729a3f1ab2b8458556601ea051dc8e0338d39cd47aa5c13e7ee8bc0846f6aff3
pdf-font-stream PDF embedded font (sfnt) at offset 0x696F 11032 bytes