Malicious PDF — malware analysis report

Static analysis result for SHA-256 754539a1c1a892fc…

MALICIOUS

PDF

56.2 KB Created: 2020-04-20 21:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cde9846d178ad46c810dbe22f32edbb7 SHA-1: 0ca8a5d81277ebd127a31d5c4ccf5dc85a87fb90 SHA-256: 754539a1c1a892fc9d6962e065be6b9d08d36ab3f8c82fd449d01b8869ae5651
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files hosted on unrelated domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains a URL that appears to be a lure related to online store trustworthiness. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external URIs aligns with techniques used to distribute malicious content or phish users.

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://zephyrhome.com/uploads/1/3/0/6/130604222/130604222.html#loja+balao+da+informatica+%C3%A9+confiavel
    • http://birdieandcoonline.com/uploads/1/3/0/7/130739781/7714151.pdf
    • http://mrandmrsmonnet.com/uploads/1/3/0/7/130775950/nawizug-mekaru-burowubuloroxa-diludeki.pdf
    • http://raphaservices.org/uploads/1/3/0/4/130489097/83aa1e2d5ddb2.pdf
    • http://reikiangelandmassage.com/uploads/1/3/0/7/130740124/fuvated-malurexo-dafusemuza.pdf
    • http://glendaledogdaycare.com/uploads/1/3/0/5/130589401/9177d7d8.pdf
    • http://relleandgreg.com/uploads/1/3/1/6/131636889/9465052.pdf
    • http://kjwkards.com/uploads/1/3/1/4/131437099/6bca79b6b.pdf
    • http://hand-made-costume.com/uploads/1/3/1/4/131413222/bed40d.pdf
    • http://mygaycoach.net/uploads/1/3/0/6/130605230/lebufogi.pdf
    • http://kjmedia1.com/uploads/1/3/0/2/130289799/3230787.pdf
    • http://ekamniearth.com/uploads/1/3/1/1/131164295/dakezunidipija_kevirigiwunizis.pdf
    • http://topnotchpd.com/uploads/1/3/1/4/131483337/cd69930626677.pdf
    • http://homeremodelsanantonio.com/uploads/1/3/0/6/130639300/1532878.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008dae.bin
20c42af06f36ef825d7bb4ce955eb2db3ae1fe5bf529a1e260c694f3acb98651
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAE 11868 bytes
font_01_sfnt_off0000b363.bin
f89c0e0946aa0d1e48aa5356a2d31bc24f5b96ca1f2cb84330b25817f6444d93
pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 2024 bytes
font_02_sfnt_off0000bcd3.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD3 16036 bytes