Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb97f2ebda2b839…

MALICIOUS

PDF

44.1 KB Created: 2020-03-31 09:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f96f2037c6876a6cf929ec0592e4bbdd SHA-1: 692e8fa862194bf6a5c4e5775175b1ae079079e7 SHA-256: acb97f2ebda2b83994d11dd059e31d4b8492e07d22fcb30086fc9d51c32552e0
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 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 partially corrupted, contains a URL that matches one of the extracted links, suggesting a deliberate attempt to direct users to external content.

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://wwwdaimondholiday.com/uploads/1/3/0/5/130546923/130546923.html#ventajas+y+desventajas+del+modelo+educativo+de+finlandia
    • http://nichellejensen4orem.com/uploads/1/3/0/4/130436244/vedagu-nuvere-wokebaxabopa-lapizejevelu.pdf
    • http://populationhealthwebcasts.com/uploads/1/3/0/6/130604557/7101071.pdf
    • http://noblemastiffs.com/uploads/1/3/0/3/130323513/2459016.pdf
    • http://lukas.palubinskas.lt/uploads/1/3/0/6/130604259/nalobemafobamuniw.pdf
    • http://phenixsalonsuitesboulder.com/uploads/1/3/0/8/130813945/wexewubot.pdf
    • http://draygoncrafts.com/uploads/1/3/1/3/131380001/mobibo-gavos-sukaxizuwebuvut.pdf
    • http://433talbotstreet.ca/uploads/1/3/0/5/130539728/pusageju_talavos_vozupobulelada.pdf
    • http://cyber-edchristianschool.com/uploads/1/3/0/4/130477074/1004621.pdf
    • http://elementsartsstudio.com/uploads/1/3/0/2/130272850/lujototijajej-mipuxew-sobapagogifed-temuwam.pdf
    • http://dvwcrm.com/uploads/1/3/0/5/130551729/9430009.pdf
    • http://squamishdoctors.com/uploads/1/3/0/6/130639085/1256813.pdf
    • http://learnwithfrank.com/uploads/1/3/0/5/130550834/kosotem.pdf
    • http://mediakit.mu/uploads/1/3/0/9/130969216/musizofik_bupuxusunez.pdf
    • http://royalluxebeauty.com/uploads/1/3/0/5/130589264/vutuxavumadimili.pdf
    • http://dordrive.com/uploads/1/3/0/9/130969852/2e681491c.pdf
    • http://smallcommun.com/uploads/1/3/0/5/130541209/350c736bfa598a.pdf
    • http://janeahtaylor.com/uploads/1/3/0/8/130873795/wiwexupidaw.pdf
    • http://tinasfunforfive.com/uploads/1/3/0/4/130436068/ae06a.pdf
    • http://mccraemoneymgmt.com/uploads/1/3/0/4/130476091/7976767.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_off00006fca.bin
b0be8be41866963caca82dbeb1421b48d91ef9e01382e9da60b88bf0e5a991a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCA 6796 bytes
font_01_sfnt_off000080ba.bin
87995230df68af584c98015d3dd0f152e807d0aca3149fafcae2a851040656bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x80BA 8596 bytes