Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3b249d5187e4e2…

MALICIOUS

PDF

45.7 KB Created: 2020-03-22 10:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a81c5355000f06911f8a523c7ac5a71a SHA-1: 9e881c0e9ad270254297ab5de467cdbf2ae6bf41 SHA-256: db3b249d5187e4e2315edcd1960c594017435b6173d294329863679765573b1c
116 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, indicating a malicious intent to redirect users. The PDF_SEO_LINK_FARM heuristic firing confirms the presence of a link farm, suggesting SEO poisoning or a phishing campaign. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or exploitation.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pennywiseautoadvisors.org/uploads/1/3/0/2/130274088/130274088.html#1+5%2F6+divided+by+3%2F4 PDF link annotation
    • http://vitamoves.nl/uploads/1/3/0/8/130874219/2472197.pdfIn PDF document text
    • http://mail.maureenkarlstad.com/uploads/1/3/0/2/130287965/fexerebub.pdfIn PDF document text
    • http://puttplaygolfcenter.net/uploads/1/3/0/2/130291373/bovudonate_mawusaj_zalitezanope_riginug.pdfIn PDF document text
    • http://pflagnorwalk.com/uploads/1/3/0/2/130289662/3769382.pdfIn PDF document text
    • http://www.gippslandbackpackers.com.au/uploads/1/3/0/3/130313294/xijut.pdfIn PDF document text
    • http://niedbrass.com/uploads/1/3/0/5/130543240/tosadibuw-vopok.pdfIn PDF document text
    • http://www.walkersbbooks.com/uploads/1/3/0/5/130552055/senomujapofuda-vibanot-muwekabivaf-naxoporabos.pdfIn PDF document text
    • http://valholl.net/uploads/1/3/0/3/130313035/976314903a.pdfIn PDF document text
    • http://babynederland.net/uploads/1/3/0/5/130543121/2155056.pdfIn PDF document text
    • http://vincestocks.com/uploads/1/3/0/6/130604795/9515305.pdfIn PDF document text
    • http://truestripes.net/uploads/1/3/0/4/130483376/898006.pdfIn PDF document text
    • http://slsglobalenterprises.com/uploads/1/3/0/5/130588349/1467921.pdfIn PDF document text
    • http://christianbuilderstx.com/uploads/1/3/0/4/130436095/1646996.pdfIn PDF document text
    • http://pagepropertiesofsavannah.info/uploads/1/3/0/6/130621732/1b1105c.pdfIn PDF document text
    • http://chaselea.co.uk/uploads/1/3/0/5/130588827/7109397.pdfIn PDF document text
    • http://www.verticalcreations.shop/uploads/1/3/0/2/130291996/pimatonapajiga-lutop-muriw-sewemepun.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://www.adobe.com/).NotoIn PDF document text
    • http://www.google.com/get/noto/http://www.adobe.com/type/ThisIn PDF document text
    • http://scripts.sil.org/OFLNotoIn 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_off00007abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABC 8812 bytes
SHA-256: e05f582e2cef92baae8548aaaeb91870fed2f1f227d38142f0b79674bdffdb67
font_01_sfnt_off00009c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C53 4144 bytes
SHA-256: 885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da

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