Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57eef63b354da62…

MALICIOUS

PDF

50.1 KB Created: 2020-03-28 05:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19a46515578991e1bbe1065c4fdbee1b SHA-1: fa63f6424301584aef1cacb14994d17a157650ad SHA-256: b57eef63b354da625571c8ce96ec78639d0656f45e450670458e191ccf49fc2b
134 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes or to direct traffic to potentially malicious domains. The ML classifier strongly indicated maliciousness. The primary attack pattern involves a link farm designed to manipulate search engine results or distribute traffic across numerous domains, some of which are associated with suspicious activity.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bridgestreampublishing.com/uploads/1/3/0/5/130588550/130588550.html#cold+war+map+europe+1945+worksheet
    • http://jonamusic.com/uploads/1/3/0/8/130814254/1290923.pdf
    • http://crystalandvarnish.com/uploads/1/3/0/4/130491271/5796142.pdf
    • http://buyrisperidoneonline2016.greatwebsitebuilder.com/uploads/1/3/0/5/130589214/1ae77.pdf
    • http://accesshealthsc.services/uploads/1/3/1/1/131164252/9068595.pdf
    • http://nc-customdesigns.com/uploads/1/3/0/4/130476344/8465835.pdf
    • http://www.specialdilliveries.com/uploads/1/3/0/4/130476519/24359f6a.pdf
    • http://www.saintpaulelectrician.net/uploads/1/3/0/2/130291658/wimopo.pdf
    • http://2broshousing.com/uploads/1/3/0/5/130550910/5720393.pdf
    • http://onlinesecurityservice.site/uploads/1/3/0/6/130639426/4113696.pdf
    • http://shopblakevan.com/uploads/1/3/0/4/130489131/gojomis.pdf
    • http://cherylhungerford.com/uploads/1/3/0/5/130550940/dapikemekufox.pdf
    • http://angelssandlot.com/uploads/1/3/0/8/130813577/1242442.pdf
    • http://www.thearthouse901.com/uploads/1/3/0/7/130740003/255da732cad386.pdf
    • http://bulldogsunleashed.com/uploads/1/3/0/2/130289670/892c56cf001f9.pdf
    • http://waytohelp.org/uploads/1/3/0/7/130739614/3684786.pdf
    • http://host186.carmichaelnl.com/uploads/1/3/0/7/130776786/7938066.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008566.bin
a56fb8bfa6dbb22e15d1a787d98b5c8b794423e19348d71eb615e7855c19e96a
pdf-font-stream PDF embedded font (sfnt) at offset 0x8566 7680 bytes
font_01_sfnt_off0000a383.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xA383 16204 bytes