Malicious PDF — malware analysis report

Static analysis result for SHA-256 a21aebad8b79066a…

MALICIOUS

PDF

42.8 KB Created: 2020-03-28 07:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 286328b42f0937bb895959ec30730b86 SHA-1: 3957cce746ab0d3fccf4fa6c83bf803aa0c49809 SHA-256: a21aebad8b79066a690cb3117f1f2690065775e4d552ffd68149bbfde8c7f0c5
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs.

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://drpatty.net/uploads/1/3/0/5/130588745/130588745.html#caracteristicas+signo+linguistico+arbitrario
    • http://aysenurguler.com/uploads/1/3/0/8/130815381/gexurudimefilag.pdf
    • http://bayareawineries.com/uploads/1/3/0/5/130550972/49d92d93d1065fa.pdf
    • http://www.newzionmbc.org/uploads/1/3/0/5/130547340/8537506.pdf
    • http://bokugroup.com/uploads/1/3/0/6/130604486/pubaravit.pdf
    • http://www.87dynamics.com/uploads/1/3/0/6/130604716/gemata.pdf
    • http://guzledscotland.com/uploads/1/3/0/6/130604326/84aa1088ae.pdf
    • http://puzzlesforprogress.com/uploads/1/3/0/7/130776858/9b38df9dafc.pdf
    • http://joemathewson.net/uploads/1/3/0/6/130604599/9520822.pdf
    • http://iptelsupport.net/uploads/1/3/0/6/130604537/kixupolijelumotom.pdf
    • http://mywickedberry.com/uploads/1/3/0/7/130776872/ea0fcdf9.pdf
    • http://www.xtrmrs.com/uploads/1/3/0/5/130550758/nexanovok-muzexewojisekal-nebuweziwu-nizax.pdf
    • http://postpartumdepressionexposed.org/uploads/1/3/0/9/130969599/dimufimunerigawon.pdf
    • http://www.dradeboramachado.com/uploads/1/3/0/6/130639941/rafadiworome.pdf
    • http://mysoulsingsstudio.org/uploads/1/3/0/4/130483273/xupolunug.pdf
    • http://theroom.club/uploads/1/3/0/4/130488691/gefuzuvonogujavijaru.pdf
    • http://greenmonsterfilms.com/uploads/1/3/0/4/130477135/541608.pdf
    • http://www.reviewsbystudents.com/uploads/1/3/0/9/130969897/192afc39f6.pdf
    • http://mesaroofrepairs.com/uploads/1/3/0/5/130540021/dakutekuka.pdf
    • http://risefootballdevelopment.com/uploads/1/3/0/6/130639714/loruxidawerotamazoti.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c75.bin
24a263bb2ed2747f72400ac9075d1bbdd4978867e3865786a2da0ddbbbcb2ba1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C75 8876 bytes