Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6411e19df27102…

MALICIOUS

PDF

51.1 KB Created: 2020-03-27 06:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: b45f6d0e7e2302741a9f0529ad762e18 SHA-1: 2436bc8ab049cdadd16c9fc5b5b0b16365fe56f2 SHA-256: de6411e19df27102429da84083cf329226fe73bf7a492601d95e634a2bf8f9cd
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list, reinforcing the malicious intent.

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://600southclark.com/uploads/1/3/0/3/130313643/130313643.html#the+star+bellied+sneetches+pdf PDF link annotation
    • http://remis-surfschool-capferret.com/uploads/1/3/0/8/130873875/wujefi.pdfIn PDF document text
    • http://ps516.org/uploads/1/3/0/9/130968985/xijosaz.pdfIn PDF document text
    • http://partywife.net/uploads/1/3/0/8/130873978/8a5b50b0.pdfIn PDF document text
    • http://stadiacatering.com/uploads/1/3/0/2/130289209/733843.pdfIn PDF document text
    • http://davidk.desertmicro.net/uploads/1/3/0/3/130324112/1665804.pdfIn PDF document text
    • http://www.pimexayb.com/uploads/1/3/0/5/130588685/b0df3a.pdfIn PDF document text
    • http://craftitunique.com/uploads/1/3/1/3/131383407/zawib.pdfIn PDF document text
    • http://cardboardbuild.com/uploads/1/3/0/4/130488252/333c51a4eb.pdfIn PDF document text
    • http://nhsofdav.com/uploads/1/3/0/8/130873861/6882364.pdfIn PDF document text
    • http://designimportstaxcosilver.com/uploads/1/3/0/4/130483400/6003599.pdfIn PDF document text
    • http://jayatherton.com/uploads/1/3/0/6/130639145/nosekuvadinuge-rilus-delobumifiwa.pdfIn PDF document text
    • http://aledobands.com/uploads/1/3/0/7/130740012/3212433.pdfIn PDF document text
    • http://mx.rosewoodgoldens.com/uploads/1/3/0/7/130775364/texigirolu.pdfIn PDF document text
    • http://www.mikeandcaroltrottatailors.com/uploads/1/3/0/4/130476014/4203165.pdfIn PDF document text
    • http://christinaparrella.com/uploads/1/3/0/3/130312996/5c767027be1b67.pdfIn PDF document text
    • http://got2go.org/uploads/1/3/0/8/130814475/58d50b27.pdfIn PDF document text
    • http://livetolula.com/uploads/1/3/0/2/130291545/4eb46c.pdfIn PDF document text
    • http://jarredventer.com/uploads/1/3/0/7/130775647/5560b665c60929.pdfIn PDF document text
    • http://www.dreamcatchersocial.com/uploads/1/3/0/7/130740199/1050126.pdfIn PDF document text
    • http://conspiracygirl.ca/uploads/1/3/0/5/130590029/xipilapo_gosuzukod_vazilujuzadekip.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8797 8000 bytes
SHA-256: b29904b7ee606a1d1c19fef9c041e6268a4ab8aa01bead1398254598802a95cc
font_01_sfnt_off0000a6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A3 16204 bytes
SHA-256: f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d

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